in combination with the parent commit that makes jdk10 use gtk3, this
lets us get onto a current webkitgtk.
since the current version of webkitgtk is still receiving security
updates, this also reverts 49ea0e2736
"eclipse: Do not use webkitgtk2 by default".
Having `glib` in the build inputs will allow its build hook to
trigger. Also adds `gsettings_desktop_schemas` as a dependency since
Eclipse appears to need the schemas under certain circumstances.
