v.out.ogr: add overwrite flag

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@48932 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.out.ogr/main.c

@@ -85,7 +85,8 @@ int main(int argc, char *argv[])
 
     module->description =
 	_("Converts a vector map to any of the supported OGR vector formats.");
-
+    module->overwrite = TRUE;
+    
     /* parse & read options */
     parse_args(argc, argv, &options, &flags);