mainboard/apple/macbook21/romstage.c: Missing prototype header

Fix warning thrown by Clang due to missing prototype for main
entry point function in -ffreestanding. main() is as any other
function in freestanding and so a prototype is strictly needed.

Change-Id: Ic27e0f93065b1aa85d3979db61b5e2ff0dd2a310
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7518
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

0 files changed, 0 insertions, 0 deletions