examples: fix two build issues surfaced with WinCE

Both may apply to rare non-WinCE Windows builds too.

- fix gcc 4.4.0 preprocessor error:
  ```
  docs/examples/http2-upload.c:43:8: error: "_MSC_VER" is not defined
  ```
  Ref: https://github.com/curl/curl/actions/runs/18238150607/job/51935502616

- fix wrong header order:
  Inlcude `windows.h` after `winsock2.h` via `curl/curl.h`.

Regressions from 45438c8d6f #18823

Closes #18843

docs/examples/http2-upload.c

@@ -40,8 +40,6 @@
 #ifndef _MSC_VER
 #include <sys/time.h>
 #include <unistd.h>
-#elif (_MSC_VER < 1900)
-#define snprintf _snprintf
 #endif
 
 #ifdef _WIN32
@@ -52,6 +50,10 @@
 #define fileno _fileno
 #endif
 
+#if defined(_MSC_VER) && (_MSC_VER < 1900)
+#define snprintf _snprintf
+#endif
+
 /* curl stuff */
 #include <curl/curl.h>
 

docs/examples/synctime.c

@@ -90,11 +90,12 @@ int main(void) { printf("Platform not supported.\n"); return 1; }
 int main(void) { printf("Platform not supported.\n"); return 1; }
 #else
 
-#include <windows.h>
 #include <time.h>
 
 #include <curl/curl.h>
 
+#include <windows.h>
+
 #if defined(_MSC_VER) && (_MSC_VER < 1900)
 #define snprintf _snprintf
 #endif