Add some missing includes

include/Pitch.h

@@ -25,6 +25,8 @@
 #ifndef PITCH_H
 #define PITCH_H
 
+#include <cstdint>
+
 typedef int16_t pitch_t;
 
 const pitch_t CentsPerSemitone = 100;

include/panning.h

@@ -29,6 +29,7 @@
 #include "lmms_basics.h"
 #include "panning_constants.h"
 #include "Midi.h"
+#include "volume.h"
 
 inline stereoVolumeVector panningToVolumeVector( panning_t _p,
 							float _scale = 1.0f )