windows: fix UWP builds, add GHA job

Add new job to test building for UWP (aka `CURL_WINDOWS_APP`).

Fix fallouts when building for UWP:
- rand: do not use `BCryptGenRandom()`.
- cmake: disable using win32 LDAP.
- cmake: disable telnet.
- version_win32: fix code before declaration.
- schannel: disable `HAS_MANUAL_VERIFY_API`.
- schannel: disable `SSLSUPP_PINNEDPUBKEY`
  and make `schannel_checksum()` a stub.
  Ref: e178fbd40a #1429
- schannel: make `cert_get_name_string()` a failing stub.
- system_win32: make `Curl_win32_impersonating()` a failing stub.
- system_win32: try to fix `Curl_win32_init()` (untested).
- threads: fix to use `CreateThread()`.
- src: disable searching `PATH` for the CA bundle.
- src: disable bold text support and capability detection.
- src: disable `getfiletime()`/`setfiletime()`.
- tests: make `win32_load_system_library()` a failing stub.
- tests/server/util: make it compile.
- tests/server/sockfilt: make it compile.
- tests/lib3026: fix to use `CreateThread()`.

See individual commits for build error details.

Some of these fixes may have better solutions, and some may not work
as expected. The goal of this patch is to make curl build for UWP.

Closes #13870

lib/asyn-thread.c

@@ -459,7 +459,7 @@ query_complete(DWORD err, DWORD bytes, LPWSAOVERLAPPED overlapped)
  * and wait on it.
  */
 static
-#if defined(_WIN32_WCE)
+#if defined(_WIN32_WCE) || defined(CURL_WINDOWS_APP)
 DWORD
 #else
 unsigned int
@@ -527,7 +527,7 @@ CURL_STDCALL getaddrinfo_thread(void *arg)
  * gethostbyname_thread() resolves a name and then exits.
  */
 static
-#if defined(_WIN32_WCE)
+#if defined(_WIN32_WCE) || defined(CURL_WINDOWS_APP)
 DWORD
 #else
 unsigned int

lib/curl_threads.c

@@ -101,7 +101,7 @@ int Curl_thread_join(curl_thread_t *hnd)
 #elif defined(USE_THREADS_WIN32)
 
 curl_thread_t Curl_thread_create(
-#if defined(_WIN32_WCE)
+#if defined(_WIN32_WCE) || defined(CURL_WINDOWS_APP)
                                  DWORD
 #else
                                  unsigned int
@@ -109,14 +109,14 @@ curl_thread_t Curl_thread_create(
                                  (CURL_STDCALL *func) (void *),
                                  void *arg)
 {
-#ifdef _WIN32_WCE
+#if defined(_WIN32_WCE) || defined(CURL_WINDOWS_APP)
   typedef HANDLE curl_win_thread_handle_t;
 #else
   typedef uintptr_t curl_win_thread_handle_t;
 #endif
   curl_thread_t t;
   curl_win_thread_handle_t thread_handle;
-#ifdef _WIN32_WCE
+#if defined(_WIN32_WCE) || defined(CURL_WINDOWS_APP)
   thread_handle = CreateThread(NULL, 0, func, arg, 0, NULL);
 #else
   thread_handle = _beginthreadex(NULL, 0, func, arg, 0, NULL);

lib/curl_threads.h

@@ -53,7 +53,7 @@
 #if defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
 
 curl_thread_t Curl_thread_create(
-#if defined(_WIN32_WCE)
+#if defined(_WIN32_WCE) || defined(CURL_WINDOWS_APP)
                                  DWORD
 #else
                                  unsigned int

lib/rand.c

@@ -48,7 +48,8 @@
 
 #ifdef _WIN32
 
-#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x600
+#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x600 && \
+  !defined(CURL_WINDOWS_APP)
 #  define HAVE_WIN_BCRYPTGENRANDOM
 #  include <bcrypt.h>
 #  ifdef _MSC_VER

lib/system_win32.c

@@ -112,7 +112,11 @@ CURLcode Curl_win32_init(long flags)
   }
 
 #ifdef USE_WINSOCK
+#ifdef CURL_WINDOWS_APP
+  ws2_32Dll = Curl_load_library(TEXT("ws2_32.dll"));
+#else
   ws2_32Dll = GetModuleHandleA("ws2_32");
+#endif
   if(ws2_32Dll) {
     Curl_FreeAddrInfoExW = CURLX_FUNCTION_CAST(FREEADDRINFOEXW_FN,
       GetProcAddress(ws2_32Dll, "FreeAddrInfoExW"));
@@ -269,11 +273,13 @@ HMODULE Curl_load_library(LPCTSTR filename)
 
 bool Curl_win32_impersonating(void)
 {
+#ifndef CURL_WINDOWS_APP
   HANDLE token = NULL;
   if(OpenThreadToken(GetCurrentThread(), TOKEN_QUERY, TRUE, &token)) {
     CloseHandle(token);
     return TRUE;
   }
+#endif
   return FALSE;
 }
 

lib/version_win32.c

@@ -80,13 +80,13 @@ bool curlx_verify_windows_version(const unsigned int majorVersion,
   bool matched = FALSE;
 
 #if defined(CURL_WINDOWS_APP)
-  (void)buildVersion;
-
   /* We have no way to determine the Windows version from Windows apps,
      so let's assume we're running on the target Windows version. */
   const WORD fullVersion = MAKEWORD(minorVersion, majorVersion);
   const WORD targetVersion = (WORD)_WIN32_WINNT;
 
+  (void)buildVersion;
+
   switch(condition) {
   case VERSION_LESS_THAN:
     matched = targetVersion < fullVersion;

lib/vtls/schannel.c

@@ -2682,6 +2682,13 @@ static void schannel_checksum(const unsigned char *input,
                               DWORD provType,
                               const unsigned int algId)
 {
+#ifdef CURL_WINDOWS_APP
+  (void)input;
+  (void)inputlen;
+  (void)provType;
+  (void)algId;
+  memset(checksum, 0, checksumlen);
+#else
   HCRYPTPROV hProv = 0;
   HCRYPTHASH hHash = 0;
   DWORD cbHashSize = 0;
@@ -2722,6 +2729,7 @@ static void schannel_checksum(const unsigned char *input,
 
   if(hProv)
     CryptReleaseContext(hProv, 0);
+#endif
 }
 
 static CURLcode schannel_sha256sum(const unsigned char *input,
@@ -2906,7 +2914,9 @@ const struct Curl_ssl Curl_ssl_schannel = {
 #ifdef HAS_MANUAL_VERIFY_API
   SSLSUPP_CAINFO_BLOB |
 #endif
+#ifndef CURL_WINDOWS_APP
   SSLSUPP_PINNEDPUBKEY |
+#endif
   SSLSUPP_TLS13_CIPHERSUITES |
   SSLSUPP_CA_CACHE |
   SSLSUPP_HTTPS_PROXY,

lib/vtls/schannel_int.h

@@ -28,7 +28,8 @@
 
 #ifdef USE_SCHANNEL
 
-#if defined(__MINGW32__) || defined(CERT_CHAIN_REVOCATION_CHECK_CHAIN)
+#if (defined(__MINGW32__) || defined(CERT_CHAIN_REVOCATION_CHECK_CHAIN)) \
+  && !defined(CURL_WINDOWS_APP)
 #define HAS_MANUAL_VERIFY_API
 #endif
 

lib/vtls/schannel_verify.c

@@ -346,6 +346,12 @@ static DWORD cert_get_name_string(struct Curl_easy *data,
                                   DWORD length)
 {
   DWORD actual_length = 0;
+#if defined(CURL_WINDOWS_APP)
+  (void)data;
+  (void)cert_context;
+  (void)host_names;
+  (void)length;
+#else
   BOOL compute_content = FALSE;
   CERT_INFO *cert_info = NULL;
   CERT_EXTENSION *extension = NULL;
@@ -457,6 +463,7 @@ static DWORD cert_get_name_string(struct Curl_easy *data,
     /* Last string has double null-terminator. */
     *current_pos = '\0';
   }
+#endif
   return actual_length;
 }