be more chatty about cannot _spawnl() error

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@39368 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/db/dbmi_client/start.c

@@ -217,6 +217,7 @@ dbDriver *db_start_driver(const char *name)
      *    descriptors in driver (which is another problem)
      */
 
+    G_debug(2,"dbmi_client/start startup: %s", startup);
     pid = _spawnl(_P_NOWAIT, startup, startup, NULL);
 
     /* This does not help. It runs but pipe remains open when close() is