Drop llvm

[sonnyp]

According to https://github.com/flathub/org.freedesktop.Sdk.Extension.rust-stable

Note: llvm13 is needed until there is a release of gcc12.1. As soon as gcc12.1 is in the freedesktop sdk, gcc can be used instead of clang.

We have gcc 13.

We should investigate dropping llvm/clang

[Hofer-Julian]

As mentioned in the chat, I wouldn't mind dropping llvm.
However, even though gcc should be new enough nowadays, I couldn't get it to work with mold.
@lw64 also didn't have more luck with Vala (here clang also didn't work tbf).

[sonnyp]

does that help flathub/org.freedesktop.Sdk.Extension.rust-stable#168 (comment) ?

[Hofer-Julian]

That is possible, would be worth exploring.

[sonnyp]

I dropped LLVM/Mold in a67091b

Follow up to re-introduce Mold #615

[sonnyp]

Mold/LLVM was reintroduced in #639

Re-opening this.

[sonnyp]

It would be great to figure this out to

1. Simplify things
2. Reduce download size for Rust extension
3. One-click "Install" button for Rust Extensions: Add button to install Vala SDK extension #711 (review)