debug/gdb: Add gdb 7.3.1, 7.4, and 7.4.1

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>
Message-Id: <c917c398e95919856980.1341286289@flambe.is-a-geek.org>

#!/bin/sh

set -e

printf "Running autoconf...\n"

autoconf -Wall --force

printf "Done. You may now run:\n    ./configure\n"