SNES: Reduced binary size by ~20KB

I refactored spc700.c:
- Replaced jump table by a switch. I'm aware that they're essentially the same thing (given our range), but the generated code is ~9KB less, so...
- Removed unnecessary inlining

Doesn't seem to have any performance impact, if anything it is marginally faster...

Possible improvements:
- Grouping identical instructions will reduce size further, but it might break the switch optimizations
- Finalizing the loop inside the function will certainly improve performance

retro-core/components/snes9x/src/apu.h

@@ -82,7 +82,6 @@ bool S9xInitSound(int32_t buffer_ms, int32_t lag_ms);
 void S9xPrintAPUState(void);
 extern uint8_t S9xAPUCycles [256];       /* Scaled cycle lengths */
 extern const uint8_t S9xAPUCycleLengths [256]; /* Raw data. */
-extern void (* const S9xApuOpcodes [256])(void);
 
 #define APU_VOL_LEFT  0x00
 #define APU_VOL_RIGHT 0x01

retro-core/components/snes9x/src/spc700.h

@@ -62,16 +62,15 @@ typedef struct
 /* Needed by ILLUSION OF GAIA */
 #define ONE_APU_CYCLE 21
 
+void APUExecute(void);
+
 #define APU_EXECUTE1() \
-{ \
-    APU.Cycles += S9xAPUCycles [*IAPU.PC]; \
-    (*S9xApuOpcodes[*IAPU.PC]) (); \
-}
+APUExecute();
 
 #define APU_EXECUTE() \
 if (IAPU.APUExecuting) \
     while (APU.Cycles <= CPU.Cycles) \
-       APU_EXECUTE1();
+      APUExecute();
 
 #endif
 #endif