Remove C linkage for debug functions
Remove C linkage for debug functions

Change-Id: I641a0fade7b1941e06ef3df608dde46e86467662
Reviewed-on: http://review.couchbase.org/94074
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Tim Bradgate <f1a26ee65f021cb7d82b83dfb09abf144d3eb64f@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine