New comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/26911#issuecomment-742150955

Comment:
> Interesting. Reverting changes in #26676 fixes cross builds.
> @sgn Any idea what could be wrong here?

Reverting #26676 skips valac from looking into correct vapidir, thus it couldn't found polkit-gobject-1 bindings in system vapidir.
And uses vendored polkit-gobject-1 bindings.
See https://github.com/void-linux/void-packages/blob/b9331f9e5ec72e8a663c4f46cfd61911070d7ad3/srcpkgs/vala-panel-appmenu/template#L21-L26

I probably need to rework on `valac` wrapper.