if you see undefined symbol '__mb_sb_limit' on 6.x

[Rong-en Fan]

The ctype fix for UTF-8 locale unfortunately introduced some
new symbols to libc. Therefore, binaries built on system with
that fix can not be used on older system. For that sake, the
fix is back-out for 6-STABLE. If you see undefined symbols
'__mb_sb_limit', please rebuild the affected binary. Everything
will be fine then. Binaries built between 20071025 and 20071030
will be affected by this.

Sorry for the inconvenience.

Regards,
Rong-En Fan