ports/188079: databases/ruby-qdbm : fix STR2CSTR usage

[swills at FreeBSD.org]

Synopsis: databases/ruby-qdbm : fix STR2CSTR usage

Responsible-Changed-From-To: ruby->swills
Responsible-Changed-By: swills
Responsible-Changed-When: Sun Mar 30 13:48:59 UTC 2014
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=188079