Patch [669508] Define Win32 symbols for CW in platform.h )backport).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@18886 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/platform.h

@@ -14,6 +14,20 @@
 #ifndef _WX_PLATFORM_H_
 #define _WX_PLATFORM_H_
 
+
+/*
+    Codewarrior doesn't define any Windows symbols until some headers are included
+*/
+#if __MWERKS__
+    #include <stddef.h>
+    #if defined(WIN32) || defined(_WIN32)
+        #ifndef WINVER
+            #define WINVER  0x0400
+        #endif
+    #endif
+#endif
+
+
 /*
    first define Windows symbols if they're not defined on the command line: we
    can autodetect everything we need if _WIN32 is defined