Use bundled jack if missing #4186
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Several systems don't ship with a jack version by default leaving missing symbols on launch.
This attempts to fix that by bundling a version of jack from the system and adding it to
LD_LIBRARY_PATHat launch time if the launcher script can't find a suitable one.This might still crash with undefined symbols on systems using jack1 instead of jack2, but we don't have the luxury to recompile some of our dependant libraries with
weakjackso I'm not sure we can easily fix that. One possibility is to take the script a bit further and inspect the exact jack version and still do the override for jack1 systems, but I'm not sure how difficult this is. Anyway...Closes #4094