Have help_exit() give a brief "See %s --help" message instead of the
full help text, and put it back in the args constraint failures.
diff --git a/lib/lib.c b/lib/lib.c
index b6277f3..d11c600 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -66,7 +66,8 @@
 {
   va_list va;
 
-  if (CFG_TOYBOX_HELP) show_help(stderr);
+  if (CFG_TOYBOX_HELP)
+    fprintf(stderr, "See %s --help\n", toys.which->name);
 
   if (msg) {
     va_start(va, msg);