buildroot

doom-wad: bump to version 1.9

Also add a hash file.

The extraction method had to be changed, since the WAD file for this
version is not distributed as a stand-alone file, but comes inside a
2-part DOS self-extracting zip archive.

Signed-off-by: Rodrigo Rebello <rprebello@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>