Fix several warnings

src/vm/gfx.h

@@ -73,7 +73,7 @@ namespace retro8
     };
 
     
-    static color_t colorForRGB(uint32_t color)
+    static inline color_t colorForRGB(uint32_t color)
     {
       switch (color & 0x00ffffff)
       {

src/vm/lua_bridge.cpp

@@ -225,7 +225,6 @@ int palt(lua_State* L)
   {
     color_t c = color_t(int(lua_tonumber(L, 1)));
     int f = lua_toboolean(L, 2);
-    palette_index_t index = gfx::DRAW_PALETTE_INDEX;
 
     machine->memory().paletteAt(gfx::DRAW_PALETTE_INDEX)->transparent(c, f);
   }

src/vm/machine.cpp

@@ -183,7 +183,6 @@ void Machine::circfill(coord_t xc, coord_t yc, amount_t r, color_t color)
   float d = 3 - 2 * r;
   circFillHelper(xc, yc, x, y, color);
 
-  int ctr = 0;
   while (y >= x)
   {
     x++;

src/vm/sound.cpp

@@ -405,9 +405,6 @@ void APU::renderSounds(int16_t* dest, size_t totalSamples)
 {
   handleCommands();
 
-  constexpr size_t rate = 44100;
-  constexpr int16_t maxVolume = 4096;
-
   memset(dest, 0, sizeof(int16_t)*totalSamples);
 
   for (size_t i = 0; i < CHANNEL_COUNT; ++i)

src/vm/sound.h

@@ -228,7 +228,7 @@ namespace retro8
       
 
     public:
-      APU(Memory& memory) : memory(memory), _soundEnabled(true), _musicEnabled(true), dsp(44100) { }
+      APU(Memory& memory) : memory(memory), dsp(44100), _soundEnabled(true), _musicEnabled(true) { }
 
       void init();