THRIFT-507. Only use Boost for building the C++ library

- Make AX_BOOST_BASE warn instead of fataling if Boost is not found.
- If Boost is not found, disable compilation of the C++ library.
- Do not use CPPFLAGS or LDFLAGS from Boost when building the compiler.

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@991253 13f79535-47bb-0310-9956-ffa450edef68
3 files changed