package/jack1: new package

package/jack1: new package

This patch adds a new jack1 package alongside the existing jack2.

While jack1 and jack2 are two equivalent implementations of the same
protocol, they differ in a few details and both of them are being
actively used (jack2 is not considered to be a replacement of jack1).

It is not possible to enable both at the same time, so hide away jack1
when jack2 is enabled (to keep existing defconfig files working).

For more information, see:
https://github.com/jackaudio/jackaudio.github.com/wiki/Q_difference_jack1_jack2

Signed-off-by: Adam Heinrich <adam@adamh.cz>
[yann.morin.1998@free.fr:
  - fix coding style
  - use the release tarball, not a git clone
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
[Peter: add host-pkgconf dependency, reorder dependencies]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>