[llvm] [CMake][Support] Suppress ml64 assembler logo printing when compiling BLAKE3 on Windows (PR #106794)

[Martin Storsjö via llvm-commits]

https://github.com/mstorsjo requested changes to this pull request.

Marking as changes requested - this unfortunately will break some of the currently supported configurations.

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