More unnecessary includes indicating hidden link dependencies...

... This brings the big s.c.c. to 88 files

src/TimerRecordDialog.cpp

@@ -85,7 +85,7 @@ enum {
 const int kSlowTimerInterval = 1000; // ms
 
 // This timer interval is used in some busy-wait loops and is much shorter.
-const int kTimerInterval = 50; // ms
+// const int kTimerInterval = 50; // ms
 
 static double wxDateTime_to_AudacityTime(wxDateTime& dateTime)
 {

src/TrackPanelCell.h

@@ -136,4 +136,7 @@ public:
        AudacityProject *project);
 };
 
+// Unnecessary #include to indicate otherwise hidden link dependencies
+#include "TrackPanel.h"
+
 #endif

src/TrackPanelDrawable.h

@@ -51,4 +51,7 @@ public:
    }
 };
 
+// Unnecessary #include to indicate otherwise hidden link dependencies
+#include "TrackPanel.h"
+
 #endif