buildgcc: Be less restrictive when trying to build GNAT

It turned out that newer GNAT versions can build our current (5.3.0)
GNAT without bootstrapping. So adapt the version enforcement.

Change-Id: Ie7189e8bcadeee56cf5c2172e8c0ae7cd534685a
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/17706
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

0 files changed, 0 insertions, 0 deletions