ports/156888: Update lang/nawk to version 20110506

[culot at FreeBSD.org]

Synopsis: Update lang/nawk to version 20110506

Responsible-Changed-From-To: freebsd-ports-bugs->culot
Responsible-Changed-By: culot
Responsible-Changed-When: Thu May 12 07:44:11 UTC 2011
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=156888