No point of specifying C linkage for static func in c++

The function is called directly from C++

Change-Id: I56ef2644380d36b1845753a08a0eeea2a4862665
Reviewed-on: http://review.couchbase.org/31202
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>