fix libretro build broken in 16dd5d40 #339

Conditionally compile out the code for the feature implemented in
16dd5d40

 (which is the throttle and frame skip configuration for the
speedup button) for libretro, and use the old behavior of skipping 9
frames.

Affects GBA.cpp and GB.cpp .
Signed-off-by: Rafael Kitover <rkitover@gmail.com>

src/gb/GB.cpp

@@ -4843,6 +4843,8 @@ void gbEmulate(int ticksToStop)
 
                 if ((gbLcdTicksDelayed <= 0) && (gbLCDChangeHappened)) {
                     int framesToSkip = systemFrameSkip;
+
+#ifndef __LIBRETRO__
                     static bool speedup_throttle_set = false;
                     static uint32_t last_throttle;
 
@@ -4868,6 +4870,10 @@ void gbEmulate(int ticksToStop)
 
                         speedup_throttle_set = false;
                     }
+#else
+                    if ((gbJoymask[0] >> 10) & 1)
+                        framesToSkip = 9;
+#endif
 
                     //gbLcdTicksDelayed = gbLcdTicks+1;
                     gbLCDChangeHappened = false;
@@ -4946,7 +4952,11 @@ void gbEmulate(int ticksToStop)
 
                             speedup = false;
 
+#ifndef __LIBRETRO__
                             if (newmask & 1 && speedup_throttle == 0)
+#else
+                            if (newmask & 1)
+#endif
                                 speedup = true;
 
                             gbCapture = (newmask & 2) ? true : false;

src/gba/GBA.cpp

@@ -3756,6 +3756,8 @@ void CPULoop(int ticks)
                     }
                 } else {
                     int framesToSkip = systemFrameSkip;
+
+#ifndef __LIBRETRO__
                     static bool speedup_throttle_set = false;
                     static uint32_t last_throttle;
 
@@ -3781,6 +3783,10 @@ void CPULoop(int ticks)
 
                         speedup_throttle_set = false;
                     }
+#else
+                    if ((joy >> 10) & 1)
+                        framesToSkip = 9;
+#endif
 
                     if (DISPSTAT & 2) {
                         // if in H-Blank, leave it and move to drawing mode
@@ -3814,7 +3820,11 @@ void CPULoop(int ticks)
 
                             speedup = false;
 
+#ifndef __LIBRETRO__
                             if (ext & 1 && speedup_throttle == 0)
+#else
+                            if (ext & 1)
+#endif
                                 speedup = true;
 
                             capture = (ext & 2) ? true : false;