Cogl now requires at least version 2.32.0 of GLib. There are no
pre-built binaries for this from tml so we have to build glib from
source. This also requires libffi. The binary packages for libffi and
zlib don't install a pc file so the script just manually generates a
fake one.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
(cherry picked from commit 9e47972759a5dda4c9e9bf13df3369510be0e324)