Makefile.proof: Increase proof timeout

Hardware is getting faster but software slower??? A few libgfxinit
proofs take longer than 1s now, so we'll double the timeout to 2s.

Change-Id: I27a39662c80216b7b7e2285c953d2f20995647ff
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.sourcearcade.org/c/libhwbase/+/475
Tested-by: Ada SPARK <gnatbot@sourcearcade.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
1 file changed