ports/166533: update math/fann from 2.1.0b to 2.2.0

[dhn at FreeBSD.org]

Synopsis: update math/fann from 2.1.0b to 2.2.0

Responsible-Changed-From-To: freebsd-ports-bugs->dhn
Responsible-Changed-By: dhn
Responsible-Changed-When: Sat Mar 31 07:40:43 UTC 2012
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=166533