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

dlls/loadperf/Makefile.in

 MODULE    = loadperf.dll
 IMPORTLIB = loadperf
 
-EXTRADLLFLAGS = -mno-cygwin
+EXTRADLLFLAGS = -mno-cygwin -Wb,--prefer-native
 
 C_SRCS = \
 	loadperf_main.c

dlls/loadperf/loadperf_main.c

@@ -31,22 +31,6 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(loadperf);
 
-BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
-{
-    TRACE("(0x%p, %d, %p)\n",hinstDLL,fdwReason,lpvReserved);
-
-    switch(fdwReason)
-    {
-    case DLL_WINE_PREATTACH:
-        return FALSE; /* prefer native version */
-    case DLL_PROCESS_ATTACH:
-        DisableThreadLibraryCalls(hinstDLL);
-        break;
-    }
-
-    return TRUE;
-}
-
 static WCHAR *strdupAW(const char *str)
 {
     WCHAR *ret = NULL;