fixed anisotropic filtering; updated librw

src/core/config.h

@@ -264,6 +264,7 @@ enum Config {
 #define IMPROVED_VIDEOMODE	// save and load videomode parameters instead of a magic number
 #define DISABLE_LOADING_SCREEN // disable the loading screen which vastly improves the loading time
 #define DISABLE_VSYNC_ON_TEXTURE_CONVERSION // make texture conversion work faster by disabling vsync
+#define ANISOTROPIC_FILTERING	// set all textures to max anisotropic filtering
 //#define USE_TEXTURE_POOL
 #ifdef LIBRW
 #define EXTENDED_COLOURFILTER		// more options for colour filter (replaces mblur)