vlc: Add PACKAGECONFIG for jack

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
vlc: Fix build with flac-1.3.0

* vlc was broken again since flac was upgraded in oe-core:
  commit 85ac4d82c77e3cab6a5867e4ec110ba07023838b
  Author: Cristian Iorga <cristian.iorga@intel.com>
  Date:   Wed Feb 12 18:42:32 2014 +0200
  Subject: flac: upgrade to 1.3.0

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>