Starting with 1.22.8 cogl code unconditionally includes eglmesaext.h.
Change configure.ac so that eglmesaext.h is only included if it actually
exists.
(From OE-Core rev: 9bfe2ab739d8987ac469924070a5526572ef1d82)
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>