x11/waybar: unbreak with --auto-features=enabled

meson.build:98:0: ERROR: Dependency "libnl-3.0" not found, tried pkgconfig
meson.build:108:0: ERROR: Dependency "wireplumber-0.4" not found, tried pkgconfig and cmake
meson.build:125:0: ERROR: Dependency "systemd" not found, tried pkgconfig and cmake

PR: 270361