jack.pc.in:
Add the custom jack_implementation=jack1 pkgconfig variable to the
generated jack.pc file to be able to distinguish jack implementations.
As jack implementations exist with jack1, jack2 and pipewire-jack, it is
not (easily) possible to distinguish them by looking at the version
alone (particularly the case with jack2 vs. pipewire-jack, as they share
the same headers).
jack.pc.in: Add the custom
jack_implementation=jack1pkgconfig variable to the generated jack.pc file to be able to distinguish jack implementations. As jack implementations exist with jack1, jack2 and pipewire-jack, it is not (easily) possible to distinguish them by looking at the version alone (particularly the case with jack2 vs. pipewire-jack, as they share the same headers).