ports/158509: Update devel/stlport to version 5.1.7

[miwi at FreeBSD.org]

Synopsis: Update devel/stlport to version 5.1.7

Responsible-Changed-From-To: freebsd-ports-bugs->miwi
Responsible-Changed-By: miwi
Responsible-Changed-When: Wed Jun 29 23:12:32 UTC 2011
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=158509