refine warning message (merge from devbr6)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@43528 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/init/lock.c

@@ -38,8 +38,7 @@ int main(int argc, char *argv[])
 #define file argv[1]
 
 #ifdef __MINGW32__
-    G_warning("Attention!");
-    G_warning("Locking is not supported on Windows!");
+    G_warning("Concurrent mapset locking is not supported on Windows");
     exit(0);
 #else
     locked = 0;