Add checks for libcurl to ./configure. Picked version 7.16.0 as lowest requirement because that's the oldest base-install I could find. I assume we can keep lowering that, if people complain.
Add checks for libcurl to ./configure. Picked version 7.16.0 as lowest requirement because that's the oldest base-install I could find. I assume we can keep lowering that, if people complain.

git-svn-id: 4fea25c0b4601f1448ac7d7dccb5b9e117453f9a@707856 13f79535-47bb-0310-9956-ffa450edef68

benoitc/couchdb-old,mhammond/couchdb,mhammond/couchdb,benoitc/couchdb-old,benoitc/couchdb-old,benoitc/couchdb-old,mhammond/couchdb,mhammond/couchdb,benoitc/couchdb-old,mhammond/couchdb