[boost] regex/ICU fix

Subject: [boost] regex/ICU fix
From: Vladimir Prus (vladimir_at_[hidden])
Date: 2009-08-20 05:00:34

As reported previously, --build-type=complete does not work if
ICU is also configured. The below patch makes build process
suppress building static Boost.Regex in this case. The wording
is as follows:

        ghost_at_wind:~/Work/Boost/boost-svn$ bjam link=static runtime-link=static --with-regex
        ....
        warning: when using ICU, Boost.Regex must be a dynamic library
        warning: forcing link=shared runtime-link=shared for Boost.Regex
        Note: Building Boost.Regex with Unicode/ICU support enabled
            Using ICU in  /usr/include

Note that the warning is printed before the message that we're using ICU,
which is ugly, but what I have is a minimal change. I'll tweak those
configuration messages for 1.41. Comments? Ok for release branch?

- Volodya