This is a mostly straight-forward rebase of our patches on top of
13.1.0. The spec files needed a change, as GCC no longer supports STABS
debug information, but we were building GCC with support for it.
Highlights of this release include static `operator()`, The Equality
Operator You Are Looking For and extended `constexpr` support.
Add a variant of auto formatting using clang-format that doesn't use
additional packages. It works by adding a buffer-local hook to
`'before-save` for all C++ project files.
Even though we tell the user to change the version manually if it
doesn't match with the current
`Toolchain/Local/i686/i686-pc-serenity/include/XX.X.X` version, it
doesn't hurt to update it properly now that versions differ by major
version.
