Fix clean build for config_parse on dtrace systems

Change-Id: I6eb572c9362ae229ec05221be3b73fe1777935d7
Reviewed-on: http://review.couchbase.org/40880
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>