There's a closed pull request on the void-packages repository

gcc: update to 9.2.0 and enable gcc-go on musl + go and objc/objc++ on cross targets
https://github.com/void-linux/void-packages/pull/14289

Description:
This updates `gcc` to 9.2.0 and while doing that, enables `gcc-go` on `musl`. It also enables `go`, `objc` and `objc++` support in crosstoolchains, allowing us to also enable them for cross targets. That mainly means our cross targets and native targets will all have `gcc` built with the same languages and subpackages, which should be a lot easier to deal with (and possibly enable crosscompiling for some GNUstep stuff etc)

(except on `mips*-musl`, as `libucontext` does not have MIPS support yet, so only enable `objc` and `objc++` on those)

Crosstoolchains updates:

- [x] aarch64
- [x] aarch64-musl
- [x] armv5tel
- [x] armv5tel-musl
- [x] armv6l
- [x] armv6l-musl
- [x] armv7l
- [x] armv7l-musl
- [x] i686
- [x] i686-musl
- [x] mips-musl
- [x] mipshf-musl
- [x] mipsel-musl
- [x] mipselhf-musl
- [x] ppc64le
- [x] ppc64le-musl
- [x] ppc64
- [x] ppc64-musl
- [x] ppc
- [x] ppc-musl
- [x] x86_64-musl

Testing:

- [x] ppc64le
- [x] ppc64le-musl
- [x] ppc64
- [x] ppc64-musl
- [x] ppc
- [x] ppc-musl
- [ ] x86_64
- [ ] x86_64-musl
- [x] aarch64 (build)
- [x] aarch64-musl (build)
- [ ] armv7l (build)