* New upstream release from the beta channel (FIREFOX_88_0b4_BUILD1)
* Use clang 12 if available
  - debian/control{,.in}
  - debian/build/rules.mk
* Update patches
  - debian/patches/rust-drop-dll-checksums.patch
  - debian/patches/python3-remove-fstrings.patch
  - debian/patches/python3-remove-variable-annotations.patch
* Pass NASM only on supported archs
  - debian/config/mozconfig.in