fix -blendcaves; make sure Z_BEST_SPEED is defined

Author: Zahl

draw_png.cpp

@@ -19,6 +19,10 @@
 #  include <direct.h>
 #endif
 
+#ifndef Z_BEST_SPEED
+#	define Z_BEST_SPEED 6
+#endif
+
 #define PIXEL(x,y) (gImageBuffer[((x) + gOffsetX) * CHANSPERPIXEL + ((y) + gOffsetY) * gPngLocalLineWidthChans])
 
 namespace

worldloader.cpp

@@ -791,9 +791,7 @@ static bool loadAllRegions()
 		printProgress(count++, max);
 		int i;
 		loadRegion((**it).filename, true, i);
-		delete *it;
 	}
-	chunks.clear();
 	printProgress(10, 10);
 	return true;
 }