Currently, we have a 'jack' package with attrname 'jack1d' and a
'jackdbus' package with attrname 'jackaudio'. Make it consistent 'jack1'
and 'jack2' in both package name and attrname.
This aligns the naming with what can be found on the JACK homepage.
Q: what's the difference between jack1 and jack2?
A: http://trac.jackaudio.org/wiki/Q_differenc_jack1_jack2
This patches the Hydrogen scons build script to work a failure to
parse the JACK version correctly. If I understand correctly upstream
Hydrogen now uses cmake instead of Scons, so this shouldn't be a
problem with the next Hydrogen release.
