Non-basic-source-character-set characters conflict with MSVC

[nobody]

There exist high-ascii characters in the Boost sources
that cannot be converted to the local region for a
given computer because the context of the originating
region of the source is not known. Thus, these
high-ascii characters may not have a proper mapping,
and a warning will be emitted by MSVC 2003 and 2005.
This should be considered a failure case because,
though low, it is still emitting an alert. Thus,
without the correct region set on your system, the
Boost sources fail to build.