util: Blake3 - Identify arm64ec as aarch64 instead of x64
util: Blake3 - Identify arm64ec as aarch64 instead of x64
ARM64EC is a new build target for Windows ARM64 devices for x64 support. Currently that build flavor fails due to attempting to use x64 intrinsics. This commit fixes it by changing the auto-detection to be aarch64 instead of x64 for arm64ec.
cc @jenatali