[boost] [random] patch to make random compile with warnings=all

From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-06-14 15:42:33

AMDG

boost/random/detail/signed_unsigned_tools.hpp has
specializations of make_unsigned for long long.  gcc
rejects this when compiling with -ansi -pedantic.
The attached patch replaces random::detail::make_unsigned
with the TypeTraits version.

Ok to commit?

In Christ,
Steven Watanabe