SERVER-8995 removed gperftools-2.0 from src/third_party
SERVER-14069 mongo tools need to set global env as well
SERVER-8994: Build fixes for boost 1.55.0 with gcc & msvc
SERVER-8994: New internal-boost option to choose internal boost version
SERVER-4905: add flag to disable mongo's builtin log rotation

To support the standalone utility, we need to give administrators
support for disabling Mongo's builtin log rotation.
Merge remote-tracking branch 'upstream/master'