Fix Makefiles

[finnbear]

No description provided.

[sheumais]

Thank you for addressing this issue so quickly! Unfortunately after this PR I still encounter an error:
makefiles/game.mk:12: *** missing separator (did you mean TAB instead of 8 spaces?). Stop.
After looking online it seems that make does not like spaces instead of tabs.
I find-and-replaced the spaces to tabs in my fork which allowed compilation.

[finnbear]

Thanks, this was due to me copy-pasting from Terminal to GitHub's online IDE (I bypassed our typical release process because my working directory has changes I don't want to release yet). Apparently, copying from Terminal converts tabs to spaces. I've now fixed this :)