Bug 1365047 Turn on the Windows DLL Blocklist in MinGW r=aklotz

MozReview-Commit-ID: 3hF7iOdH89P

--HG--
extra : rebase_source : 95614960544ae55b983dbbd40e1036ff236204b3

mozglue/build/WindowsDllBlocklist.h

@@ -6,7 +6,7 @@
 #ifndef mozilla_windowsdllblocklist_h
 #define mozilla_windowsdllblocklist_h
 
-#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
+#if (defined(_MSC_VER) || defined(__MINGW32__))  && (defined(_M_IX86) || defined(_M_X64))
 
 #include <windows.h>
 #include "mozilla/GuardObjects.h"