Hardening the packages I maintain. We use `--replace-fail` in every case except for `python3Packages.remi`, which does a glob `--replace-quiet` to reduce warnings
···2525 postPatch = ''
2626 # default to store ffmpeg
2727 substituteInPlace ffmpy.py \
2828- --replace 'executable="ffmpeg",' 'executable="${ffmpeg-headless}/bin/ffmpeg",'
2828+ --replace-fail 'executable="ffmpeg",' 'executable="${ffmpeg-headless}/bin/ffmpeg",'
29293030 # The tests test a mock that does not behave like ffmpeg. If we default to the nix-store ffmpeg they fail.
3131 for fname in tests/*.py; do