This isn't usually found amongst official disc images. I've only
encountered it with a hacked version of the NTSC Semi-brick fix disc.
Reference: https://hackmii.com/2008/05/ntsc-semi-brick-fix/
It didn't properly align scanlines in 256-color images and didn't work
on big-endian systems, plus it wouldn't compile properly on Mac OS X
for some reason.
This effectively fixes issue #135:
rpcli: CI8 BMP export may be unaligned.