Inhibit reading of environment when G_no_gisinit() is used

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@40855 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/gis/gisinit.c

@@ -90,6 +90,8 @@ void G__no_gisinit(const char *version)
 	G_fatal_error(_("Incompatible library version for module. "
 			"You need to rebuild GRASS or untangle multiple installations."));
 
+    G_set_gisrc_mode(G_GISRC_MODE_MEMORY);
+
     gisinit();
 }