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

dlls/atmlib/Makefile.in

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

dlls/atmlib/main.c

@@ -24,21 +24,6 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(atmlib);
 
-BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD reason, LPVOID lpv)
-{
-    TRACE("(%p, %d, %p)\n", hInstDLL, reason, lpv);
-
-    switch (reason)
-    {
-    case DLL_WINE_PREATTACH:
-        return FALSE;    /* prefer native version */
-    case DLL_PROCESS_ATTACH:
-        DisableThreadLibraryCalls(hInstDLL);
-        break;
-    }
-    return TRUE;
-}
-
 BOOL WINAPI ATMProperlyLoaded(void)
 {
     FIXME("stub\n");