Rollup merge of #149312 - mati865:push-uxlynzmxzswo, r=wesleywiser

Mark riscv64gc-unknown-linux-musl as tier 2 target

According to https://github.com/rust-lang/rust/blob/cdb4236e654a49c3035269588fe22dfafc0cfa3a/src/doc/rustc/src/platform-support/riscv64gc-unknown-linux-musl.md?plain=1#L3 it's tier 2 target.

In case you are wondering how I noticed it:
Dockerfiles at Wild linker repo started to fail building recently due to missing `riscv64gc-unknown-linux-musl` std. I had hoped the problem would go away by itself, but it did not (it never does...).
rust-lang/rust#148983 happened recently, so I checked https://rust-lang.github.io/rustup-components-history/riscv64gc-unknown-linux-musl.html and yeah, the date matches.
Given this condition: https://github.com/rust-lang/rust/blob/cdb4236e654a49c3035269588fe22dfafc0cfa3a/src/tools/build-manifest/build.rs#L35 I'm certain PR will fix the problem.

Author: Zalathar