rust: Upgrade 1.71.1 -> 1.72.0

rust: Upgrade 1.71.1 -> 1.72.0

Drop getrandom-open64.patch (merged upstream).

Revert https://github.com/rust-lang/cc-rs/commit/c4f414f449bb7cffba3bc923f277704d1d08a8ec
("Map source absolute paths to OUT_DIR as relative. (#684)") which
causes hashed versions of the build path to be used as part of the
filename of generated objects and hence reproducibility issues.

https://blog.rust-lang.org/2023/08/24/Rust-1.72.0.html

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>