* New upstream stable release (68.0build1)

[ Olivier Tilloy ]
* Update debian/patches/unity-menubar.patch
* Work around a GGC bug on i386 and s390x (https://gcc.gnu.org/PR90756)
  - debian/patches/skcms-workaround-gcc-bug.patch
* New firefox-geckodriver package (LP: #1831204)
* Stop building firefox-testsuite (LP: #1805019)
* Port chromium-browser's autopkgtests to firefox (LP: #1831454)

[ Rico Tzschichholz ]
* Update patches
  - debian/patches/mark-distribution-search-engines-as-read-only.patch
  - debian/patches/no-region-overrides-for-google-search.patch
  - debian/patches/partially-revert-google-search-update.patch
  - debian/patches/ppc-no-static-sizes.patch
  - debian/patches/support-coinstallable-trunk-build.patch
  - debian/patches/ubuntu-ua-string-changes.patch
* Bump build-dep on rustc >= 1.34.0 and cargo >= 0.35
  - debian/control{,.in}
* Update cbindgen to 0.8.7
  - debian/build/create-tarball.py
* Update locales, remove 'as', 'mai', 'ml' and 'or'
* Update debian/config/searchplugins.conf
* Follow change of location of list.json for searchplugins
  - debian/rules