ports/186381: fix sysutils/spindown compile errors with clang

[rodrigo at FreeBSD.org]

Synopsis: fix sysutils/spindown compile errors with clang

Responsible-Changed-From-To: freebsd-ports-bugs->rodrigo
Responsible-Changed-By: rodrigo
Responsible-Changed-When: Thu Feb 13 12:44:31 UTC 2014
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=186381