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

dlls/pdh/Makefile.in

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

dlls/pdh/pdh_main.c

@@ -67,25 +67,6 @@ static inline WCHAR *pdh_strdup_aw( const char *src )
     return dst;
 }
 
-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;
-    case DLL_PROCESS_DETACH:
-        if (lpvReserved) break;
-        DeleteCriticalSection(&pdh_handle_cs);
-        break;
-    }
-
-    return TRUE;
-}
-
 union value
 {
     LONG     longvalue;