winebuild: Don't set the IMAGE_FILE_DLL flag on native modules.

tools/winebuild/main.c

@@ -594,6 +594,7 @@ int main(int argc, char **argv)
     switch(exec_mode)
     {
     case MODE_DLL:
+        if (spec->subsystem != IMAGE_SUBSYSTEM_NATIVE)
             spec->characteristics |= IMAGE_FILE_DLL;
         load_resources( argv, spec );
         load_import_libs( argv );