Update for rgbds >= 0.6.0

[orbea]

I was curious to see if I could build a functional gbc rom, but the rgbds version in Gentoo is too new... I also confirmed it still builds with a locally built copy of rgbds 0.5.2 and the current rgbds git master branch.

I used sed(1) to update the MACROS.

grep -rl ': MACRO' | xargs sed -i 's/\(.*\): MACRO/MACRO \1/'