- Add some `odeprecated` - Make some `odeprecated` now `odisabled` - Remove `odisabled` code. - Remove old update migrations - Remove GCC 4.0 compiler - Remove Tiger-only code - Remove 32-bit-only code - Remove use of LD64 - Remove GCC 4.3 - 4.8 support.
Define MacOS.version, MacOS.full_version, and MacOS::Xcode.version to Version::NULL on Linux so that brew readall succeeds and Homebrew/brew can tap Homebrew/core on Linux.