fix: add patchelf requirement for android

[henryiii]

This adds "patchelf" on platforms where Android wheels can be built, since it's required. It's not added on platforms where a binary isn't available, which shouldn't be building Android wheels either.

The alternative is to just require users to pre-install it, which isn't bad, but I think this is nicer?

See pybind/pybind11#5714 (comment).

[henryiii]

@mhsmith, it looks like we are getting Error: cibuildwheel: Couldn't find 'patchelf' in PATH when running on macOS (https://github.com/pybind/pybind11/actions/runs/17138877560/job/48621564021?pr=5809), maybe we should see if patchelf is installed alongside cibuildwheel and then use it from there if it was present?

[mhsmith]

Yes, this is the same issue we previously had with wheel: the cibuldwheel GitHub action runs cibuildwheel without activating the environment, so the environment's bin directory isn't on the PATH. I'll deal with this in #2568.