Modernize code

Can compile with arm-none-eabi-gcc 8.3.0
gbafix correctly handles ELF input

src/roulette_util.c

@@ -409,6 +409,7 @@ void UpdatePulseBlend(struct PulseBlend *pulseBlend)
                         }
                         break;
                     case 2: // Flip back and forth
+                        // This code is never reached
                         if (pulseBlendPalette->fadeDirection)
                             pulseBlendPalette->blendCoeff = 0;
                         else