ports/145604: [UPDATE] devel/py-waf to 1.5.15

[yzlin at FreeBSD.org]

Synopsis: [UPDATE] devel/py-waf to 1.5.15

Responsible-Changed-From-To: freebsd-python->yzlin
Responsible-Changed-By: yzlin
Responsible-Changed-When: Fri Apr 16 17:43:57 UTC 2010
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=145604