Update freetype for the Windows toolchain
Add pkg-config, a52dec and mpeg2dec to the ps3 toolchain
Add pkg-config to the macos toolchain
Allows to remove the macos specific patch
Add glew and iconv to allow building ResidualVM
To the Windows and macOS toolchains only.
Use the unpatched upstream PS3 toolchain
All the ScummVM specific patches have been merged.
Add a Playstation 3 worker
The worker is based on a custom version of ps3dev/ps3toolchain
patched to use GCC 7.2.0 instead of 4.7.4. It also includes an
updated version of SDL2-PSL1GHT.