msdrm: Use --prefer-native instead of DLL_WINE_PREATTACH.

dlls/msdrm/Makefile.in

 MODULE    = msdrm.dll
 
-EXTRADLLFLAGS = -mno-cygwin
-
-C_SRCS = \
-	main.c
+EXTRADLLFLAGS = -Wb,--prefer-native

dlls/msdrm/main.c

-/*
- * msdrm.dll
- *
- * Copyright 2016 Austin English
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
- */
-
-#include <stdarg.h>
-
-#include "windef.h"
-#include "winbase.h"
-
-BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, void *reserved)
-{
-    switch (reason)
-    {
-        case DLL_WINE_PREATTACH:
-            return FALSE;    /* prefer native version */
-        case DLL_PROCESS_ATTACH:
-            DisableThreadLibraryCalls(instance);
-            break;
-    }
-
-    return TRUE;
-}