Revert "Remove obsolete jackaudio version 1."

This reverts commit bdb77826d98544ab37741f740dd3516023924b27.

Jack1 is not obsolete and neither jack1 nor jack2 is called 'jackaudio'.

Q: What's the difference between Jack1 and Jack2?
A: http://trac.jackaudio.org/wiki/Q_differenc_jack1_jack2