Removed erroneous switch to the front buffer when reading depth values in sculptmode and retopo.

source/blender/src/drawview.c

@@ -2689,10 +2689,8 @@ void view3d_update_depths(View3D *v3d)
 		}
 		
 		if(d->damaged) {
-			glReadBuffer(GL_FRONT);
 			glReadPixels(v3d->area->winrct.xmin,v3d->area->winrct.ymin,d->w,d->h,
 				     GL_DEPTH_COMPONENT,GL_FLOAT, d->depths);
-			glReadBuffer(GL_BACK);
 			
 			glGetDoublev(GL_DEPTH_RANGE,d->depth_range);
 			

source/blender/src/sculptmode.c

@@ -547,9 +547,7 @@ float get_depth(short x, short y)
 	x+= curarea->winrct.xmin;
 	y+= curarea->winrct.ymin;
 	
-	glReadBuffer(GL_FRONT);
 	glReadPixels(x, y, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &depth);
-	glReadBuffer(GL_BACK);
 
 	return depth;
 }