Backport of "examples: don't try and build jack examples if jack was disabled" into 1.20
requested to merge tpm/gstreamer:backport-mr-2656-into-1.20-meson-jack-examples-with-jack-disabled into 1.20
Backport of !2656 (merged) "examples: don't try and build jack examples if jack was disabled".
Commits:
- 0e551871 examples: don't try and build jack examples if jack was disabled