Add support for loongarch64

[Catty2014]

Artifacts are used in osu!lazer and work well.

[kasperk81]

@zv-io can you add loongarch64 in musl.cc? in alpine linux, the official alpine riscv64 was added in alpine 20 and loongarch64 in alpine 21 https://pkgs.alpinelinux.org/packages?branch=v3.21&repo=&arch=loongarch64 so now it maybe possible without too much trouble for musl.cc?

best would be if we don't have to change this infra for loongarch64

[4Darmygeometry]

@zv-io can you add loongarch64 in musl.cc? in alpine linux, the official alpine riscv64 was added in alpine 20 and loongarch64 in alpine 21 https://pkgs.alpinelinux.org/packages?branch=v3.21&repo=&arch=loongarch64 so now it maybe possible without too much trouble for musl.cc?

best would be if we don't have to change this infra for loongarch64

LoongArch64 musl cross can be found in https://github.com/musl-cross/musl-cross/releases/tag/20250206
Early in https://github.com/musl-cross/musl-cross/releases/tag/20240317

[kasperk81]

the best case for this repository is if https://musl.cc picks up loongarch64 so we don't need to do something "different". that was my point.

when going to add support for new arch in random repositories, i try to adhere to their existing infra. which is why i waited for musl.cc riscv64 support before opening #24. of course there are multiple ways to do stuff, but this is the least disruptive one.. the upside is if someone else using musl.cc, they will get the new arch support because there are many similar requirements from the community.