G_spawn() needs _spawnvp() rather than _spawnv() on Windows

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@37071 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/gis/spawn.c

@@ -81,7 +81,7 @@ int G_spawn(const char *command, ...)
 	return -1;
     }
 
-    return _spawnv(_P_WAIT, command, args);
+    return _spawnvp(_P_WAIT, command, args);
 }
 
 #else