libjack API of libjackserver.so is fully non functional

[nedko]

The jack client API is not operational for users of libjackserver.so

All functions fail, e.g.:

[W][54824.983372] jack | [ pipewire-jack.c: 4591 jack_cpu_load()] 'c != NULL' faile
d at ../pipewire-0.3.71/pipewire-jack/src/pipewire-jack.c:4591 jack_cpu_load() [W][54824.983759] jack | [ pipewire-jack.c: 4560 jack_get_buffer_size()] 'c != NULL' failed at ../pipewire-0.3.71/pipewire-jack/src/pipewire-jack.c:4560 jack_get_buffer_size(
)

Commit fb44d34 adds PIPEWIRE_INTERNAL env var check to jack emulation, an environment variable that is set early in pipewire's daemon main()