A fix (bug #6309: myisamchk compiled without debug support , --help shows vise versa

bug #6380: mysqlcheck --help prints wrong --debug msg for non-debug version).

client/mysqlcheck.c

@@ -81,8 +81,13 @@ static struct my_option my_long_options[] =
    "To check several databases. Note the difference in usage; In this case no tables are given. All name arguments are regarded as databasenames.",
    (gptr*) &opt_databases, (gptr*) &opt_databases, 0, GET_BOOL, NO_ARG,
    0, 0, 0, 0, 0, 0},
+#ifdef DBUG_OFF
+  {"debug", '#', "This is a non-debug version. Catch this and exit.",
+   0, 0, 0, GET_DISABLED, OPT_ARG, 0, 0, 0, 0, 0, 0},
+#else
   {"debug", '#', "Output debug log. Often this is 'd:t:o,filename'.",
    0, 0, 0, GET_STR, OPT_ARG, 0, 0, 0, 0, 0, 0},
+#endif
   {"default-character-set", OPT_DEFAULT_CHARSET,
    "Set the default character set.", (gptr*) &default_charset,
    (gptr*) &default_charset, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},

myisam/myisamchk.c

@@ -354,8 +354,12 @@ static void usage(void)
   puts("Description, check and repair of MyISAM tables.");
   puts("Used without options all tables on the command will be checked for errors");
   printf("Usage: %s [OPTIONS] tables[.MYI]\n", my_progname_short);
-  printf("\nGlobal options:\n\
-  -#, --debug=...     Output debug log. Often this is 'd:t:o,filename'.\n\
+  printf("\nGlobal options:\n");
+#ifndef DBUG_OFF
+  printf("\
+  -#, --debug=...     Output debug log. Often this is 'd:t:o,filename'.\n");
+#endif
+  printf("\
   -?, --help          Display this help and exit.\n\
   -O, --set-variable var=option.\n\
                       Change the value of a variable. Please note that\n\