build: Revise dependencies

gvfs is using a set of glib libraries (gio-2.0, gio-unix-2.0, glib,
gobject-2.0) in almost all the created objects. However, these
dependencies are not always necessary.

gvfs' meson port also uses some internal dependencies formed by
built libraries. This internal dependencies depend on other
dependendecies as well.

These both issues have been fixed by reviewing all the internal
dependencies and built objects.

https://bugzilla.gnome.org/show_bug.cgi?id=794365