Remove ununsed, commented code

src/drivers/libretro/libretro.c

@@ -171,8 +171,6 @@ static unsigned serialize_size;
 
 /* emulator-specific callback functions */
 
-void UpdatePPUView(int refreshchr) { }
-
 const char * GetKeyboard(void)
 {
    return "";

src/ppu.c

@@ -1243,7 +1243,6 @@ int FCEUPPU_Loop(int skip) {
 
 			for (scanline = 0; scanline < ppu.totalscanlines; ) {	/* scanline is incremented in  DoLine.  Evil. :/ */
 				deempcnt[deemp]++;
-				/* if ((PPUViewer) && (scanline == PPUViewScanline)) UpdatePPUView(1); */
 				DoLine();
 				if (scanline < ppu.normal_scanlines || scanline == ppu.totalscanlines)
 					overclocking = 0;

src/ppuview.h

@@ -1,8 +1,6 @@
 #ifndef _FCEU_PPUVIEW_H
 #define _FCEU_PPUVIEW_H
 
-extern int PPUViewScanline;
-extern int PPUViewer;
 extern int scanline;
 
 void PPUViewDoBlit();