pyoxidizer can’t find target Python distribution on ARM

Here is the build log: [pyoxidizer cargo test](https://github.com/indygreg/PyOxidizer/files/5868062/pyoxidizer-cargo-test.txt)

When running `cargo test --bin pyoxidizer --release`, most tests fail due to it not finding the default Python distribution for armv7-unknown-linux-gnueabihf, apparently.

This is running on a Nintendo Switch running ArchLinuxARM, in an AArch32 chroot. I haven’t tested in AArch64 yet but I assume the outcome will be similar.

Start with the linked build log and reproduce `cargo test --bin pyoxidizer --release` on the reported `armv7-unknown-linux-gnueabihf` target. Trace why the default Python distribution is not found and compare the behavior with the reported AArch32 environment; done means the relevant tests locate the target distribution on ARM.

Written by the indexing model from the issue text.