Add missing and remove unnecessary #include statements

Note: if user code requires a header, then user code must #include it.

FL/Fl_Help_View.H

@@ -26,8 +26,6 @@
 #include "Fl.H"
 #include "Fl_Group.H"
 #include "Fl_Scrollbar.H"
-#include <FL/fl_draw.H>   // this is no longer needed here, but external source code seems to rely on it
-#include <FL/filename.H>  // this is no longer needed here, but external source code seems to rely on it
 
 //
 // System and C++ header files

src/Fl_Help_View.cxx

@@ -40,6 +40,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdint.h>
 #include <ctype.h>
 #include <errno.h>
 #include <math.h>