glx/apple: automake: include builddir prior to srcdir

Analogous to previous commit.

Cc: "12.0 13.0" <mesa-dev@lists.freedesktop.org>
Cc: Jeremy Huddleston Sequoia <jeremyhu@apple.com>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Jeremy Sequoia <jeremyhu@apple.com>
(cherry picked from commit 5b874cee099122bc9c0625254895e63843ae2260)
1 file changed