Limit logic required for building locally
- Always build the systemd-tests package. The python package also has a python-tests subpackage (https://archlinux.org/packages/core/x86_64/python-tests/) so there is precedence for shipping a tests package.
- Get rid of mode and vcs_tag conditionalization, we can do this upstream via $MESON_EXTRA_CONFIGURE_OPTIONS.
- Build in non-verbose mode. The verbose output is too verbose to be useful and the systemd package is not built by a build service where logs would be more useful so it doesn't make sense to build in verbose mode.