clutter: Add fribidi dependency and copy deprecated pango functions

Pango functions pango_unichar_direction() and pango_find_base_dir() have been deprecated in pango 1.44, since these are used mostly clutter and gtk, copy the code from pango and use fribidi dependency explicitly.

This is the same strategy used by Gtk.

!583 (merged)

See gtk@c23e07f6, this is needed also by !582 (merged)