ports/158994: Fix security/libgcrypt 1.5.0 build with clang

[edwin at FreeBSD.org]

Synopsis: Fix security/libgcrypt 1.5.0 build with clang

Responsible-Changed-From-To: freebsd-ports-bugs->dim
Responsible-Changed-By: edwin
Responsible-Changed-When: Sun Jul 17 12:10:21 UTC 2011
Responsible-Changed-Why: 
Submitter has GNATS access (via the GNATS Auto Assign Tool)

http://www.freebsd.org/cgi/query-pr.cgi?pr=158994