* Remove a duplicate wmneu optdep
* Add python-pytest checkdep
* Disable new crazy-complete dep as upstream provides the completion
  files already

Switch to arch-meson, other cleanups

https://github.com/enkore/j4-dmenu-desktop/releases/tag/r3.0

Also, some PKGBUILD changes:

- Depend on system packages for libraries instead of downloading and compiling
  from source.
- Use SPDX license identifiers.
- Add pkgver() function.

devtools 20230105-1 enables the debug option by default.

A follow-up commit will remove debug from alongside other options.