Use busy wait loop

If not using busy wait loop, linkage with WINMM in Windows platform is
required

src/core.c

@@ -83,7 +83,7 @@
 #define SUPPORT_MOUSE_GESTURES
 #define SUPPORT_CAMERA_SYSTEM
 #define SUPPORT_GESTURES_SYSTEM
-//#define SUPPORT_BUSY_WAIT_LOOP
+#define SUPPORT_BUSY_WAIT_LOOP
 #define SUPPORT_GIF_RECORDING
 //-------------------------------------------------