Un-perl commit-msg hook

Un-perl commit-msg hook

To simplify installation on mingw a bit (even though git remains a pain),
drop the perl dependency the commit-msg hook introduced to the coreboot
development environment.
It's replaced by awk which we use elsewhere already (and is a more lightweight
utility in any case)

Change-Id: I67adfe1ec43c898735d4bae4819ceb53e83c303b
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/78
Tested-by: build bot (Jenkins)
Reviewed-by: Peter Stuge <peter@stuge.se>