Print out the C++ language version being used

Change-Id: I1f2fa6c8e8927ad712e160d667fd8ed148b4b9f3
Reviewed-on: http://review.couchbase.org/40907
Reviewed-by: Dave Rigby <daver@couchbase.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>