[llvm] [CMake][Support] Use /nologo when compiling BLAKE3 assembly sources on Windows (PR #106794)

[Martin Storsjö via llvm-commits]

https://github.com/mstorsjo approved this pull request.

LGTM, thanks!

The PR description, which gets used as the commit message when merged, still reflects the original variant of the patch, so it’d be good to tweak that as well. Or whoever merges it can fix up the wording before pressing merge as well.

https://github.com/llvm/llvm-project/pull/106794