ports/185398: Fix comms/xmorse build with Clang

[marino at FreeBSD.org]

Synopsis: Fix comms/xmorse build with Clang

Responsible-Changed-From-To: freebsd-ports-bugs->marino
Responsible-Changed-By: marino
Responsible-Changed-When: Sat Jan 25 00:35:53 UTC 2014
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=185398