Move guts of help command into show_help() in lib/help.c, with config TOYBOX_HELP controlling infrastructure.
diff --git a/lib/lib.c b/lib/lib.c
index 955f242..66cecbc 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -52,11 +52,7 @@
 {
   va_list va;
 
-  if (CFG_HELP && toys.exithelp) {
-    *toys.optargs=*toys.argv;
-    USE_HELP(help_main();)  // dear gcc: shut up.
-    fprintf(stderr,"\n");
-  }
+  if (CFG_TOYBOX_HELP && toys.exithelp) show_help();
 
   va_start(va, msg);
   verror_msg(msg, 0, va);