and the OS X port.

to ios-image.cpp, but disable it on OS X because UIKit isn't available.

and slightly tweak the API syntax.

CppUnit is really too large for our needs, would require to be precompiled
for many platforms, in all combinations of debug and release modes, with
additional variants for libstdc++ versions. We replace it with our own
lightweight implementation, LolUnit. Good riddance.

so that it builds properly.

sub-millisecond but can be improved if we get rid of SDL timers.