Consider supporting armv7-unknown-linux-gnueabi/hf toolchain

[aignas]

Feature request

It seems that the latest standalone python release contains a
toolchain for armv7 for Python 3.11 and Python 3.12. In #1770 a new platform
definition has been added and it seems that the platform labels that are used
in the release are different. We have armv7-unknown-linux-gnu and the
published toolchain binaries are for:

• armv7-unknown-linux-gnueabi
• armv7-unknown-linux-gnueabihf

I am not sure what would be the right thing to do here yet as I am not using
armv7 toolchains yet, but maybe @UebelAndre could help us out here with providing
requirements (PRs are also welcome) on how we could use the upstream toolchains.

[UebelAndre]

Feels like we need some support on bazelbuild/platforms#38

[aignas]

This got accidentally closed in #1837.