Remove the partial_dependency workaround
See the XXX in https://gitlab.freedesktop.org/wayland/weston/blob/ccf24076ddd42b1523e135e0827a31358d6fbd19/libweston/meson.build#L105 .
Once we require at least Meson 0.50.1, remove the workaround.
See the XXX in https://gitlab.freedesktop.org/wayland/weston/blob/ccf24076ddd42b1523e135e0827a31358d6fbd19/libweston/meson.build#L105 .
Once we require at least Meson 0.50.1, remove the workaround.