Wrong binaryen release downloaded for linux aarch64

In the function `binaryenUrl` converts `aarch64` to `arm64` to produce the URL to download binaryen. This is the correct behviour for mac, but on linux the correct architecture label for `aarch64` releases is just `aarch64`.

https://github.com/denoland/wasmbuild/blob/816dc32252284c93b57e7b03cff7b61b43c74594/lib/wasmopt.ts#L124

The correct URL for linux aarch64 should be (assuming binaryen version_130):

https://github.com/WebAssembly/binaryen/releases/download/version_130/binaryen-version_130-aarch64-linux.tar.gz

not

https://github.com/WebAssembly/binaryen/releases/download/version_130/binaryen-version_130-arm64-linux.tar.gz

which is what is produced currently.

Start in lib/wasmopt.ts at binaryenUrl around line 124 and compare the architecture mapping for macOS and Linux. Verify that Linux aarch64 resolves to the Binaryen aarch64-linux archive URL rather than the arm64-linux URL, using the example in the issue as the expected result.

Written by the indexing model from the issue text.