meson.build: set `WIREPLUMBER_CONFIG_DIR` in devenv
This is needed for wireplumber to start up correctly in the meson
devenv when built as a subproject of pipewire. The reason for this
is that the value set for `PIPEWIRE_CONFIG_DIR` in the wireplumber
meson build file will be overriden when the pipewire meson files
set up another devenv with its own `PIPEWIRE_CONFIG_DIR`.
An alternative solution is to make pipewire support multiple directories in PIPEWIRE_CONFIG_DIR
and use env.prepend()
when setting PIPEWIRE_CONFIG_DIR
in the pipewire devenv.
I am not sure which one is better. Is WIREPLUMBER_CONFIG_DIR
deprecated? Is its use discouraged?
And I've just noticed that wp-uninstalled.sh
only sets WIREPLUMBER_CONFIG_DIR
.