bug#22094: jack2: jack_control uses wrong python version

[Florian Paul Schmidt]

jack_control needs to be run with python2:

fps@cherry ~/src/guix$ jack_control ep
  File "/home/fps/.guix-profile/bin/jack_control", line 80
    print 'shit'

[sic]

The interpreter shebang points to a python3.4 though

#!/gnu/store/l9vhjpqza8piap4r047m5xfz86wnxgqw-python-wrapper-3.4.3/bin/python

name_base = 'org.jackaudio'
control_interface_name = name_base + '.JackControl'

Flo