CI: rfl: add temporary commit for invalid_runtime_symbol_definitions

The compiler is adding `invalid_runtime_symbol_definitions` [1], thus
temporarily add a patch.

As usual, the patch will eventually make it to the Linux kernel so that
both sides are good.

Link: #155521 [1]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: ojeda

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

@@ -2,7 +2,8 @@
 
 set -euo pipefail
 
-LINUX_VERSION=v7.1-rc1
+# https://github.com/rust-lang/rust/pull/155521
+LINUX_VERSION=0df88b7dc85c906a161c27d78c26e6d0e74c4310
 
 # Build rustc, rustdoc, cargo, clippy-driver and rustfmt
 ../x.py build --stage 2 library rustdoc clippy rustfmt