Clang 18.1 remove rust pins

[catenacyber]

A draft following #12365 and plan to cherry-pick e0d6875

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[catenacyber]

cc @maflcko we will see with CI which projects fail for unpinning

[maflcko]

All projects that need modifications should still be failing, for example quiche, see #12094. Also, CI may not be able to compile all of them in the limited time, so it may be better to unpin them in "batches" or one-by-one? But up to you. Either way seems fine, if it works.

[maflcko]

In this file, and all files that have OLD_LLVMPASS set: I think you can remove it as well, if the unpin really works, but I haven't tried it myself.

[catenacyber]

Do you mean to remove all the lines like projects/bearssl/Dockerfile:ENV OLD_LLVMPASS 1 ?

I can try that.
But let me first get a green CI ;-)

[catenacyber]

All projects that need modifications should still be failing, for example quiche, see #12094.

Indeed

Also, CI may not be able to compile all of them in the limited time, so it may be better to unpin them in "batches" or one-by-one? But up to you. Either way seems fine, if it works.

There are 20 projects, I hope CI can handle it