ports/153676: Delete obsolete gnat 3.15p ports (five)

[wen at FreeBSD.org]

Synopsis: Delete obsolete gnat 3.15p ports (five)

Responsible-Changed-From-To: freebsd-ports-bugs->wen
Responsible-Changed-By: wen
Responsible-Changed-When: Wed Jan 5 00:09:40 UTC 2011
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=153676