debug/gdb: simplify the dependency logic

Signed-off-by: Cody P Schafer <dev@codyps.com>
Message-Id: <1d9659fcf6a9c7694ad2.1399687691@localhost>
Patchwork-Id: 347583

 #!/bin/sh

 set -e

 printf "Running autoconf...\n"

 autoconf -Wall --force

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