[boost] Bug #2501: upgrade_to_unique_lock doesn't compile on C++0x mode

Hi, is there any chance that the patch attached to bug #2501 can/will be in 1.43? It works for me (with minor patch adjustments) and IMHO is safe to be merged into trunk. I've been patching my local copy of boost for the last 6 releases... I'm a little tired of doing that :) []s, rod