Update winmain.cpp

Author: ruben2020

gui/winmain.cpp

@@ -6,7 +6,7 @@ Taken from:
 
 This license applies only to this file:
 
-Copyright (C) 2001-2017 Julian Raschke, Jan Lücker and all contributors.
+Copyright (C) 2001-2017 Julian Raschke, Jan Lücker and all contributors.
 
 Permission is hereby granted, free of charge, to any person obtaining a
 copy of this software and associated documentation files (the "Software"),
@@ -31,7 +31,8 @@ DEALINGS IN THE SOFTWARE.
 
 */
 
-#ifdef _MSC_VER
+//#ifdef _MSC_VER
+#ifdef _WIN32
 
 #include <windows.h>
 #include <exception>