LinuxServer Changes:
Add mesa-va-gallium package for AMD transcoding.
tvheadend Changes:
Clean up Debian postinst and postrm scripts
- Fix indentation
- Remove unnecessary {} around variables
- Double-quote all variables when assigned or used as arguments
- Simplify quotes and escaping in creation of the superuser file
- Remove needless variable assignments
- Use $() for command substitution instead of ``