tidy-up: C and CI

- drop redundant casts for `CURL_UNCONST()` pointers (Windows).
- GHA/linux: delete redundant/dupe `-g` C flag in memory sanitizer job.
  Spotted-by: Daniel Stenberg
- examples/http2-upload: drop local macro.
- examples/http2-upload: drop leading underscore from union name.
- examples/http2-upload: drop interim macro.
- tests/server/util: reapply patch lost in a rebase.
- sync `main()` declarations across the codebase.

Closes #22559

docs/examples/anyauthput.c

@@ -88,7 +88,7 @@ static size_t read_cb(char *ptr, size_t size, size_t nmemb, void *stream)
   return nread;
 }
 
-int main(int argc, const char **argv)
+int main(int argc, const char *argv[])
 {
   CURL *curl;
   CURLcode result;

docs/examples/ftp-wildcard.c

@@ -97,7 +97,7 @@ static size_t write_cb(char *buff, size_t size, size_t nmemb, void *cb_data)
   return written;
 }
 
-int main(int argc, const char **argv)
+int main(int argc, const char *argv[])
 {
   /* curl easy handle */
   CURL *curl;

docs/examples/htmltidy.c

@@ -74,7 +74,7 @@ static void dumpNode(TidyDoc doc, TidyNode tnod, int indent)
   }
 }
 
-int main(int argc, const char **argv)
+int main(int argc, const char *argv[])
 {
   CURL *curl;
   char curl_errbuf[CURL_ERROR_SIZE];

docs/examples/http2-download.c

@@ -187,7 +187,7 @@ static int setup(struct transfer *t, int num)
 /*
  * Download many transfers over HTTP/2, using the same connection!
  */
-int main(int argc, const char **argv)
+int main(int argc, const char *argv[])
 {
   CURLcode result;
   struct transfer *trans;

docs/examples/http2-upload.c

@@ -67,20 +67,18 @@
 #endif
 
 #ifdef _MSC_VER
-#define gettimeofday(a, b) my_gettimeofday(a, b)
-static int my_gettimeofday(struct timeval *tp, void *tzp)
+static int gettimeofday(struct timeval *tp, void *tzp)
 {
   (void)tzp;
   if(tp) {
-/* Offset between 1601-01-01 and 1970-01-01 in 100 nanosec units */
-#define WIN32_FT_OFFSET 116444736000000000
     union {
       CURL_TYPEOF_CURL_OFF_T ns100; /* time since 1 Jan 1601 in 100ns units */
       FILETIME ft;
-    } _now;
-    GetSystemTimeAsFileTime(&_now.ft);
-    tp->tv_usec = (long)((_now.ns100 / 10) % 1000000);
-    tp->tv_sec = (long)((_now.ns100 - WIN32_FT_OFFSET) / 10000000);
+    } now;
+    GetSystemTimeAsFileTime(&now.ft);
+    tp->tv_usec = (long)((now.ns100 / 10) % 1000000);
+    /* subtract offset between 1601-01-01 and 1970-01-01 in 100ns units */
+    tp->tv_sec = (long)((now.ns100 - 116444736000000000) / 10000000);
   }
   return 0;
 }
@@ -286,7 +284,7 @@ static int setup(struct input *t, int num, const char *upload)
 /*
  * Upload all files over HTTP/2, using the same physical connection!
  */
-int main(int argc, const char **argv)
+int main(int argc, const char *argv[])
 {
   CURLcode result;
   struct input *trans;

docs/examples/httpput-postfields.c

@@ -47,7 +47,7 @@ static const char olivertwist[] =
  * CURLOPT_POSTFIELDS to the URL given as an argument.
  */
 
-int main(int argc, const char **argv)
+int main(int argc, const char *argv[])
 {
   CURL *curl;
   CURLcode result;

docs/examples/httpput.c

@@ -73,7 +73,7 @@ static size_t read_cb(char *ptr, size_t size, size_t nmemb, void *stream)
   return retcode;
 }
 
-int main(int argc, const char **argv)
+int main(int argc, const char *argv[])
 {
   CURL *curl;
   CURLcode result;

docs/examples/multi-event.c

@@ -211,7 +211,7 @@ static int handle_socket(CURL *curl, curl_socket_t s, int action, void *userp,
   return 0;
 }
 
-int main(int argc, const char **argv)
+int main(int argc, const char *argv[])
 {
   CURLcode result;
 

docs/examples/multi-uv.c

@@ -225,7 +225,7 @@ static int cb_socket(CURL *curl, curl_socket_t s, int action,
   return 0;
 }
 
-int main(int argc, const char **argv)
+int main(int argc, const char *argv[])
 {
   CURLcode result;
   struct datauv uv = { 0 };

docs/examples/smooth-gtk-thread.c

@@ -165,7 +165,7 @@ static gboolean cb_delete(GtkWidget *window, gpointer data)
   return FALSE;
 }
 
-int main(int argc, const char **argv)
+int main(int argc, const char *argv[])
 {
   GtkWidget *top_window, *outside_frame, *inside_frame, *progress_bar;
 

docs/examples/sslbackend.c

@@ -40,7 +40,7 @@
  *  **** This example only works with libcurl 7.56.0 and later! ****
  */
 
-int main(int argc, const char **argv)
+int main(int argc, const char *argv[])
 {
   const char *name = argc > 1 ? argv[1] : "openssl";
   CURLsslset result;

docs/internals/CODE_STYLE.md

@@ -104,7 +104,7 @@ if(!x)
 For functions the opening brace should be on a separate line:
 
 ```c
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
   return 1;
 }

docs/libcurl/curl_strequal.md

@@ -44,7 +44,7 @@ string comparison functions. This function works on all platforms.
 # EXAMPLE
 
 ~~~c
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
   const char *name = "compare";
   if(curl_strequal(name, argv[1]))

docs/libcurl/curl_strnequal.md

@@ -47,7 +47,7 @@ string comparison functions. This function works on all platforms.
 # EXAMPLE
 
 ~~~c
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
   const char *name = "compare";
   if(curl_strnequal(name, argv[1], 5))

docs/libcurl/opts/CURLINFO_TLS_SSL_PTR.md

@@ -140,7 +140,7 @@ static size_t wf(char *ptr, size_t size, size_t nmemb, void *stream)
   return size * nmemb;
 }
 
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
   CURLcode result;
   curl = curl_easy_init();

docs/libcurl/opts/CURLOPT_PROTOCOLS.md

@@ -82,7 +82,7 @@ All protocols built-in.
 # EXAMPLE
 
 ~~~c
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
   CURL *curl = curl_easy_init();
   if(curl) {

docs/libcurl/opts/CURLOPT_PROTOCOLS_STR.md

@@ -65,7 +65,7 @@ All protocols built-in
 # EXAMPLE
 
 ~~~c
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
   CURL *curl = curl_easy_init();
   if(curl) {

docs/libcurl/opts/CURLOPT_READFUNCTION.md

@@ -100,7 +100,7 @@ size_t read_callback(char *ptr, size_t size, size_t nmemb, void *userdata)
   return retcode;
 }
 
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
   FILE *file = fopen(argv[1], "rb");
   CURLcode result;

docs/libcurl/opts/CURLOPT_REDIR_PROTOCOLS.md

@@ -87,7 +87,7 @@ HTTP, HTTPS, FTP and FTPS
 # EXAMPLE
 
 ~~~c
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
   CURL *curl = curl_easy_init();
   if(curl) {

docs/libcurl/opts/CURLOPT_REDIR_PROTOCOLS_STR.md

@@ -71,7 +71,7 @@ HTTP, HTTPS, FTP and FTPS
 # EXAMPLE
 
 ~~~c
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
   CURL *curl = curl_easy_init();
   if(curl) {