Remove lang/gnat-gcc41 which is a couple of versions behind upstream and
based on GCC 4.1 which is not maintained any more, either.
Approved by: maintainer
- unbreak building at 7.x;
- update to gcc snapshot 20060901.
- bump PORTREVISION.
Submitted by: Karel Miklav <karel at lovetemple.net> (maintainer by email)