Get link colors from theme state, not properties
Since Gtk 3.12, the link-color
and visited-link-color
properties are deprecated and removed from several stylesheets. (see gtk@ac96c352 )
The documentation recommends to use the GTK_STATE_FLAG_LINK
and GTK_STATE_FLAG_VISITED
state flags to color it.
This is notably used in https://gitlab.gnome.org/GNOME/evolution/blob/master/src/modules/webkit-editor/e-webkit-editor.c#L1688