yet another bugfix: HyperRogue 3.4

Some more minor bugs have been found, so HyperRogue 3.4 is released.

Eagles now can kill your friends only in their first move (it was illogical that they could kill you only in the first move, but your friends in both moves)

You can no longer be possesed by Ghosts, Seeps, Slimes, and Ivies while using an Orb of Shielding (thanks for ortoslon to noticing this bug)

Slimes and Ghosts will now attack your friends

Slime color under items is no longer displayed (it was irrelevant)

You can now drop dead orbs into slime to change its color

Compiling: you can now remove "#define GFX" in graph.cpp if you have no access to SDL_gfx and/or don't want graphics; some fixes to the Mac makefile (but I am still not sure whether it works)