[boost] Build changes for 1.40

Subject: [boost] Build changes for 1.40
From: Vladimir Prus (vladimir_at_[hidden])
Date: 2009-07-11 07:23:12

FYI,
I've merged Boost.Build from trunk to release branch. The most
important change is that now, on Unix, default build with act
as if --layout=system is specified, creating libraries with no
decoration that can be conveniently used.

Other changes are documented at:

        http://beta.boost.org/users/news/version_1_40_0

Let me know if this causes any problems.

- Volodya