Fix build failure on mingw for hostlist

- Include <limits.h> for hostlist's LONG_MIN/LONG_MAX

Change-Id: I77186603c74844f707ef5b5af32d81c9bad02b55
Reviewed-on: http://review.couchbase.org/31806
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>