also add C4267 to list of disabled MSVC warnings
also add C4267 to list of disabled MSVC warnings

apparently there's a dedicated code for size_t conversions

Change-Id: I6e76f03938b34fd385283485c4ee2d44527e534a
Reviewed-on: http://review.couchbase.org/69931
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

avsej/libcouchbase,kojiromike/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,kojiromike/libcouchbase,mody/libcouchbase,mody/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,avsej/libcouchbase