Disable a tuning library API which is unused and non-RT

src/external/tunings/include/Tunings.h

@@ -133,12 +133,14 @@ namespace Tunings
      */
     Scale evenTemperament12NoteScale();
 
+#if 0 // Note(jpc): not rewritten RT-safe, not used, disabled
     /**
      * evenDivisionOfSpanByM provides a scale referd to as "ED2-17" or
      * "ED3-24" by dividing the Span into M points. eventDivisionOfSpanByM(2,12)
      * should be the evenTemperament12NoteScale
      */
     Scale evenDivisionOfSpanByM( int Span, int M );
+#endif
 
     /**
      * readKBMStream returns a KeyboardMapping from a KBM input stream

src/external/tunings/src/Tunings.cpp

@@ -159,6 +159,7 @@ namespace Tunings
         return res;
     }
 
+#if 0
     Scale evenDivisionOfSpanByM( int Span, int M )
     {
         if( Span <= 0 )
@@ -182,6 +183,7 @@ namespace Tunings
 
         return parseSCLData( oss.str() );
     }
+#endif
 
     KeyboardMapping readKBMStream(std::istream &inf)
     {