safety has been enabled in gcc3 & libstdc++
- correct detection of thread support in libstdcpp3.hpp
- correct multiple defined T_DIVIDE
- use threads for python.jam
NOTE: this update requires userland to be rebuild with the recent
gcc3/libstdc++ changes. See current.html for instructions.
adjust atomic_count.hpp to only use libstdc++ when it has been built with
thread support and fall back to using the pthreads implementation.
diagnosed, tested and okay deanna@
"regex/v4/perl_matcher_non_recursive.hpp in the Boost regex library
(aka Boost.Regex) in Boost 1.33 and 1.34 allows context-dependent
attackers to cause a denial of service (failed assertion and crash)
via an invalid regular expression."
ok naddy@
