Fixme to warn about winnt and ntdef in some future version (this change only adds a comment)

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@3960 4407c894-4637-0410-b4f5-ada5f102cad1

mingw-w64-headers/include/ntdef.h

diff --git a/mingw-w64-headers/include/ntdef.h b/mingw-w64-headers/include/ntdef.h
index 2e58d18..a481b47 100644
--- a/mingw-w64-headers/include/ntdef.h
+++ b/mingw-w64-headers/include/ntdef.h
@@ -21,6 +21,12 @@
 #ifndef _NTDEF_
 #define _NTDEF_
 
+#ifdef _WINNT_
+/* FIXME: In version two, warn about including both ntdef.h and winnt.h
+ * #warning Including winnt.h and ntdef.h is deprecated and will be removed in a future release.  Please use winternl.h
+ */
+#endif
+
 #include <_mingw.h>
 
 #if defined(__x86_64) && \