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

dlls/windowscodecsext/Makefile.in

@@ -2,7 +2,7 @@ MODULE    = windowscodecsext.dll
 IMPORTLIB = windowscodecsext
 IMPORTS   = ole32
 
-EXTRADLLFLAGS = -mno-cygwin
+EXTRADLLFLAGS = -mno-cygwin -Wb,--prefer-native
 
 C_SRCS = \
 	main.c

dlls/windowscodecsext/main.c

@@ -30,22 +30,6 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
 
-BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, LPVOID reserved)
-{
-    TRACE("(%p, %u, %p)\n", instance, reason, reserved);
-
-    switch (reason)
-    {
-        case DLL_WINE_PREATTACH:
-            return FALSE;    /* prefer native version */
-        case DLL_PROCESS_ATTACH:
-            DisableThreadLibraryCalls(instance);
-            break;
-    }
-
-    return TRUE;
-}
-
 /******************************************************************
  * DllGetClassObject
  */