Add linux aarch64 wheel build support

[odidev]

Add linux aarch64 wheel build support.

Related to #275 @earwig Could you please review this PR?

[coveralls]

Coverage remained the same at 99.168% when pulling e1df071 on odidev:odidev_mwparserfromhell into dcf7ba4 on earwig:develop.

[legoktm]

Very cool! Did you test the wheels generated by this on an aarch64 platform to make sure they work?

The use of QEMU rather than cross compiling or using a proper aarch64 runner is interesting, but it seems like that's what pypa does too: https://cibuildwheel.readthedocs.io/en/stable/faq/#emulation

[odidev]

Very cool! Did you test the wheels generated by this on an aarch64 platform to make sure they work?

Yes, I have tested the generated wheels and they are working fine.

The use of QEMU rather than cross-compiling or using a proper aarch64 runner is interesting, but it seems like that's what pypa does too: https://cibuildwheel.readthedocs.io/en/stable/faq/#emulation

Yes, the pypa also uses qemu with cibuildwheel as arm64 is not directly supported in github actions and currently there is no tool for cross-compilation.

[earwig]

Thanks!