remove libsdl-dev and libvpx-dev build-dependencies on x32
explicitely build-depend on libfontconfig1-dev, libfreetype6-dev, libgl1-mesa-dev, libpulse-dev and libxext-dev
Imported Upstream version 2.4.4
Merge tag 'upstream/2.4.4'

Upstream version 2.4.4
drop patches included upstream
enable libx265, where possible
prepare new upload