CCBC-1363: Allow using parent project's hdr_histogram_static target
CCBC-1363: Allow using parent project's hdr_histogram_static target

Change-Id: Ic17bd808ed64ab260f5fe5fbf61e246c469fa261
Reviewed-on: http://review.couchbase.org/c/libcouchbase/+/144138
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

kojiromike/libcouchbase,kojiromike/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase