Set glu_enabled when pkg-config detects GLU. This is needed so
that HAVE_GLU is properly set to enable the GLU based demos.
(From OE-Core rev: 72192d55cc6b213b6304dc805566c60a78d96b02)
Signed-off-by: Drew Moseley <drew_moseley@mentor.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>