THRIFT-4138: Remove undefined behavior imported from Boost
Client: C++

There is undefined behavior in boost::lexical_cast that was fixed in
https://github.com/boostorg/lexical_cast/issues/21, but that fix is
only available in recent Boost releases. This patch removes all uses
of lexical_cast instead.

That removes the last undefined behavior, so this patch also makes
ubsan.sh unconditionally fail on undefined behavior.

This closes #1232
10 files changed