Move backboxrect off of Graphics

No need for a temporary rect to be on the Graphics class itself.

desktop_version/src/Graphics.cpp

@@ -95,7 +95,6 @@ void Graphics::init()
 
     // initialize everything else to zero
     backBuffer = NULL;
-    backboxrect = SDL_Rect();
     bcol = 0;
     bcol2 = 0;
     ct = colourTransform();
@@ -1952,7 +1951,7 @@ void Graphics::drawbackground( int t )
                 break;
             }
 
-            backboxrect = backboxes[i];
+            SDL_Rect backboxrect = backboxes[i];
             backboxrect.x = lerp(backboxes[i].x - backboxvx[i], backboxes[i].x);
             backboxrect.y = lerp(backboxes[i].y - backboxvy[i], backboxes[i].y);
 

desktop_version/src/Graphics.h

@@ -284,7 +284,6 @@ public:
 	std::vector<int> backboxvx;
 	std::vector<int> backboxvy;
 	std::vector<float> backboxint;
-	SDL_Rect backboxrect;
 
 	int warpskip, warpfcol, warpbcol;