meson: Allow access to WP tools in uninstalled shell
If WirePlumber is built as a subproject this calls the wireplumber's
wp-uninstalled.sh
command to be able to run PW and WP commands from
the uninstalled shell.
If WirePlumber is built as a subproject this calls the wireplumber's
wp-uninstalled.sh
command to be able to run PW and WP commands from
the uninstalled shell.