[llvm] [Support] Adjust .note.GNU-stack guard in Support/BLAKE3/blake3_*_x86… (PR #76229)

[Rainer Orth via llvm-commits]

rorth wrote:

> Did you propose this to https://github.com/BLAKE3-team/BLAKE3/tree/master/c ? The next upgrader will likely notice this local change.

Not yet: I'd seen that there were many patches local to LLVM that seemed not to have gone upstream.  I'll give it a try.

https://github.com/llvm/llvm-project/pull/76229