[boost] lexical_cast fixes

[Beman Dawes]

Kevlin has done an update that "incorporates the overloading fix and is 
less permissive about which platforms will get wide character support."

The Win32 tests are now looking as good or better than with the old 1.29.0 
version. See 
http://boost.sourceforge.net/regression-logs/cs-win32-RC_1_30_0-diff.html

So now we'll wait until some of the other platform tests get updated. If 
their results looks as good then the update can stay in 1.30.0.

Thanks,

--Beman

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