[$] Gccrs after libcore

Despite its increasing popularity, the Rust programming language is still
supported by a single compiler, the LLVM-based rustc. At the 2025 GNU Tools
Cauldron, Pierre-Emmanuel Patry said that a lot of people are waiting
for a GCC-based Rust compiler before jumping into the language. Patry, who
is working on just that compiler (known as 'gccrs'), provided an update on
the status of that project and what is coming next.