Add `linux-loongarch64` support

[alexrp]

Can be done with Zig 0.14.1 or 0.15.0.

Note: TargetLibraryVersion needs to be set to 2.36 for this when targeting glibc.

Blocked on:

• Add a linux-loongarch64 toolset zig-toolsets#71

[alexrp]

Cross-compilation support has shipped, but this issue stays open until a native toolset package is available.