Revert "Death to C++"

This reverts commit 066ac22605.

src/midi/midi.h

@@ -2,9 +2,9 @@
 
 #include "base/base_core.h"
 
-typedef struct MidiEngine MidiEngine;
+struct MidiEngine;
 
-typedef struct MidiDeviceInfo {
+struct MidiDeviceInfo {
     char    name[64];
     S32 id;
     B32    is_input;
@@ -12,9 +12,9 @@ typedef struct MidiDeviceInfo {
     B32    releasing;   // true during release flash
     S32 velocity;    // last note-on velocity (0-127)
     S32 note;        // last MIDI note number (0-127)
-} MidiDeviceInfo;
+};
 
-MidiEngine     *midi_create(void);
+MidiEngine     *midi_create();
 void            midi_destroy(MidiEngine *engine);
 void            midi_refresh_devices(MidiEngine *engine);
 S32         midi_get_device_count(MidiEngine *engine);