meson: Rework gir/typelib generation and dependencies

Don't use --include-uninstalled, it's not needed with Meson because we
take care of inter-gir target dependencies.

Add girs and typelibs to the relevant libpango*_dep declared
dependencies so that they can be used via subprojects.

https://bugzilla.gnome.org/show_bug.cgi?id=787414