CI: rfl: move job forward to Linux v6.16-rc1

Remove the comment on top as well, since that issue is now fixed in this
new tag.

Signed-off-by: Miguel Ojeda <[email protected]>

Author: ojeda

src/ci/docker/scripts/rfl-build.sh

@@ -2,8 +2,7 @@
 
 set -euo pipefail
 
-# https://github.com/Rust-for-Linux/linux/issues/1163
-LINUX_VERSION=3ca02fc80cc4fdac63aaa6796642f1e07be591d6
+LINUX_VERSION=v6.16-rc1
 
 # Build rustc, rustdoc, cargo, clippy-driver and rustfmt
 ../x.py build --stage 2 library rustdoc clippy rustfmt