iOS: Removed unused constant in demo.
diff --git a/Xcode-iOS/Demos/src/mixer.c b/Xcode-iOS/Demos/src/mixer.c
index 30d7e47..81f0166 100644
--- a/Xcode-iOS/Demos/src/mixer.c
+++ b/Xcode-iOS/Demos/src/mixer.c
@@ -9,7 +9,6 @@
#define NUM_CHANNELS 8 /* max number of sounds we can play at once */
#define NUM_DRUMS 4 /* number of drums in our set */
-#define MILLESECONDS_PER_FRAME 16 /* about 60 frames per second */
static struct
{