Allow BOOST_TYPE_INDEX_FORCE_NO_RTTI_COMPATIBILITY for MSVC

BOOST_TYPE_INDEX_FORCE_NO_RTTI_COMPATIBILITY had no effect for MSVC. With this change, it is treated like BOOST_NO_RTTI also for MSVC.
Merge pull request #5 from MarcelRaad/patch-1

Allow BOOST_TYPE_INDEX_FORCE_NO_RTTI_COMPATIBILITY for MSVC