This makes it possibly to run Linux binaries compiled with udev support on
Linux systems which do not provide udev (typically systemd-less distros).
If udev is missing, we fall back to parsing `/dev/input` like when compiled
without udev support (`udev=no`).
Also adding some verbose debug statements to know which method we're using
when debugging Linux joypad issues.
The libudev so wrappers were generated on Mageia 8 with libudev 246.9 using
https://github.com/hpvb/dynload-wrapper:
```
./generate-wrapper.py --include /usr/include/libudev.h --sys-include '<libudev.h>' \
--soname libudev.so.1 --init-name libudev --omit-prefix gnu_ \
--output-header libudev-so_wrap.h --output-implementation libudev-so_wrap.c
```
Until we provide a cross-platform pre-commit hook that can perform those changes
on Windows, this only leads to a lot of frustration from Windows contributors.
The UTF-8, newline and EOF and BOM checks are still good to keep as those are
issues that we'd otherwise have to point out manually in the review.
The removed changes are mostly cosmetic and should be handled by clang-format
ideally, or by some self-developed cross-platform tooling.
It's too hard to get compatibility between GNU and BSD sed,
so let's just use perl oneliners.
And improve it to also remove trailing tabs, not just spaces.
