Fixed _WIN32_WINNT not being set to Windows XP.

README.md

@@ -204,6 +204,8 @@ See the [GLFW documentation](http://www.glfw.org/docs/latest/).
 
 ## Changelog
 
+ - [Win32] Bugfix: `_WIN32_WINNT` was not set to Windows XP or later
+
 
 ## Contact
 

src/win32_platform.h

@@ -52,10 +52,13 @@
  #define UNICODE
 #endif
 
-// GLFW requires Windows XP
+// GLFW requires Windows XP or later
 #ifndef WINVER
  #define WINVER 0x0501
 #endif
+#ifndef _WIN32_WINNT
+ #define _WIN32_WINNT 0x0501
+#endif
 
 #include <windows.h>
 #include <mmsystem.h>