Log Message:
Update ruby-launchy to 2.4.2.  Part of PR/48447.

pkgsrc change:
Update HOMEPAGE per http://rubygems.org/gems/launchy (the old page is 403)

Changes from HISTORY.md:

## Version 2.4.2 - 2013-11-28
* Fix kde issue - <https://github.com/copiousfreetime/launchy/issues/72> - \ 
colbell

## Version 2.4.1 - 2013-11-26
* Abstract out the argv of the commandline - \ 
<https://github.com/copiousfreetime/launchy/issues/71>

## Version 2.4.0 - 2013-11-12
* Support `Launchy.open( url, :debug => true )` - \ 
<http://github.com/copiousfreetime/launchy/issues/63> - schmich
* Fix inconsistencies in `debug?` and `dry_run?` methods - \ 
<http://github.com/copiousfreetime/launchy/issues/63> - schmich
* Fix detection of missing *nix desktops - \ 
<http://github.com/copiousfreetime/launchy/issues/70>
* Fix running tests in bare Linux environment - \ 
<http://github.com/copiousfreetime/launchy/issues/67> - gioele
* Fix mistaking windows drive as uri schema - \ 
<http://github.com/copiousfreetime/launchy/issues/65>
* Attempt fixing windows `start` command oddities, again - \ 
<http://github.com/copiousfreetime/launchy/issues/62>