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Fix GCC -Wconversion warning in newer GCC versions

Fixes #53

--- a/sim.c

+++ b/sim.c

@@ -62,7 +62,7 @@

 // Returns UINT8_MAX if not a valid note.

 static U8 midi_note_number_of(Glyph g) {

   int sharp = (g & 1 << 5) >> 5; // sharp=1 if lowercase

-  g &= ~(1 << 5);                // make uppercase

+  g &= (Glyph) ~(1 << 5);        // make uppercase

   if (g < 'A' || g > 'Z')        // A through Z only

     return UINT8_MAX;

   // We want C=0, D=1, E=2, etc. A and B are equivalent to H and I.