* New upstream stable release (66.0build3)

[ Olivier Tilloy ]
* Re-enable and update debian/patches/unity-menubar.patch
* Disable unaligned FP accesses emulation on armhf:
  - armhf-disable-unaligned-fp-access-emulation.patch

[ Rico Tzschichholz ]
* Bump build-dep to clang-7 and llvm-7-dev
  - debian/config/mozconfig.in
  - debian/control{,.in}
* Add build-dep on nasm (>= 2.13.02)
  - debian/control{,.in}
* Bump build-dep on rustc >= 1.31.0 and cargo >= 0.32
* Update cbindgen to 0.7.1
  - debian/build/create-tarball.py
* Fix arm64 build
  - debian/patches/revert-1fce91651f43.patch
* Update patches
  - debian/patches/reduce-rust-debuginfo-on-selected-architectures.patch
  - debian/patches/ppc-no-static-sizes.patch
  - debian/patches/partially-revert-google-search-update.patch
* Drop upstreamed patches
  - remove debian/patches/dont-treat-tilde-as-special.patch