crossgcc: point users to the log file in case of error

The first problem for crossgcc users that encounter build errors is
figuring out what is wrong with the build. Point out where the logs
reside.

Change-Id: I0300ecf6356c1a4ce18ae1e37fe0a56f46210d13
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/8982
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed