Multiple arch in same tc

[Mathieu Poumeyrol]

dinghy/dinghy-lib/src/platform/regular_platform.rs

Line 81 in 6604727

 break; 

homebrew musl install brew install FiloSottile/musl-cross/musl-cross --with-aarch64 put several arch in /usr/local/opt/musl-cross/libexec/

dinghy just picks the first.