Dependencies for unsupported architectures should be ignored

[eschnett]

I noticed today that the package MKL_jll on macOS has oneAPI_jll as dependency. Since oneAPI is supported on macOS this jll is downloaded. However, MKL is not supported on macOS, and thus this dependency isn't actually needed.

It would be convenient if BinaryBuilder "zeroed out" all dependency declarations for architectures that are not supported when building Yggdrasil packages. These dependencies are never used.

One could do this manually, either directory or in a loop after the dependencies = ... definition in the Yggdrasil recipe, but it would be more convenient if BinaryBuilder did this automatically.