Removed MEMORY_ODD_ACCESS, SOUND_C, USE_NEW_SPRITE, GRAPHEM_C, USE_C and USE_ASM
defines in defs.h and defs.inc, these are obsolete and not used anywhere.
Turned off PC_PTR and turned PREFETCH on.
The reason for this is that the HRM states the only officially supported
reset code relies on the prefetching of data in the 68000.
