rust: Work around reproducibility issues

rust: Work around reproducibility issues

Add a patch which removes the sections of code which encode buildpaths. Whilst
not ideal, the patches at least show where the problematic data is coming from
and should allow more focused work to resovle it by someone who has a better
understanding of rust and what this code is doing. It does look unlikely we
actually need this code in our usecases anyway.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>