Defines starting with `e' in src/cpu

• ECS_DENISE src/cpu/sysconfig.h:34
• ENDTRY src/cpu/mmu_common.h:20
• ENFORCER src/cpu/sysconfig.h:33
• ENUMDECL src/cpu/sysdeps.h:254
• EXCEPTION_FPP src/cpu/fpp.c:32