Fix 32-bit personality support for aarch64-linux

[kylewlacy]

Follow-up from #716

Currently, at least 2 packages needed to be tweaked due to errors around 32-bit personality support for aarch64-linux builds:

• proot
• strace

...my understanding is still a bit fuzzy, but I believe "32-bit personality" means using e.g. ARM32 (aarch32) binaries on ARM64 (aarch64) platforms (or x86 binaries on x86-64 platforms). We basically had to change the build options for both packages, meaning that neither supports 32-bit personalities on aarch64 now. Conversely, I believe both packages do support 32-bit personalities on x86-64.

(My best guess is this is related to the toolchain. It's a bit weird 32-bit personality support apparently works fine on x86-64, but not aarch64. Maybe it's some gcc/glibc/etc default that's different between x86-64 and aarch64?)

[MrDullDev]

As far as i know "personality" is a just a fancy way to say "a way system
calls are made", so basically it's OS <--> APP ABI, which coincidentally
differs even on "compatible" architectures on the same OS like for example on
i386 and amd64. So i think it only matters for apps/libraries that
directly poke around the ABIs and such things.

Also here's strace documentation on the topic
https://github.com/strace/strace/blob/05a6b475e3e7abc58dcfb8a6128af4bbfbecc365/dist/INSTALL#L40
and it seems that supporting '32-bit on 64-bit' in such apps is a separate
hurdle, so it's no wonder that strace supports it on amd64 but doesn't on
aarch64