Fix redundant process_music.c in sources

build_keyboard.mk

@@ -139,12 +139,27 @@ ifeq ($(strip $(API_SYSEX_ENABLE)), yes)
     MIDI_ENABLE=yes
 endif
 
+MUSIC_ENABLE := 0
+
+ifeq ($(strip $(AUDIO_ENABLE)), yes)
+    OPT_DEFS += -DAUDIO_ENABLE
+    MUSIC_ENABLE := 1
+	SRC += $(QUANTUM_DIR)/process_keycode/process_audio.c
+	SRC += $(QUANTUM_DIR)/audio/audio.c
+	SRC += $(QUANTUM_DIR)/audio/voices.c
+	SRC += $(QUANTUM_DIR)/audio/luts.c
+endif
+
 ifeq ($(strip $(MIDI_ENABLE)), yes)
     OPT_DEFS += -DMIDI_ENABLE
-	SRC += $(QUANTUM_DIR)/process_keycode/process_music.c
+	MUSIC_ENABLE := 1
 	SRC += $(QUANTUM_DIR)/process_keycode/process_midi.c
 endif
 
+ifeq ($(MUSIC_ENABLE), 1)
+	SRC += $(QUANTUM_DIR)/process_keycode/process_music.c
+endif
+
 ifeq ($(strip $(COMBO_ENABLE)), yes)
     OPT_DEFS += -DCOMBO_ENABLE
 	SRC += $(QUANTUM_DIR)/process_keycode/process_combo.c
@@ -154,15 +169,6 @@ ifeq ($(strip $(VIRTSER_ENABLE)), yes)
     OPT_DEFS += -DVIRTSER_ENABLE
 endif
 
-ifeq ($(strip $(AUDIO_ENABLE)), yes)
-    OPT_DEFS += -DAUDIO_ENABLE
-	SRC += $(QUANTUM_DIR)/process_keycode/process_music.c
-	SRC += $(QUANTUM_DIR)/process_keycode/process_audio.c
-	SRC += $(QUANTUM_DIR)/audio/audio.c
-	SRC += $(QUANTUM_DIR)/audio/voices.c
-	SRC += $(QUANTUM_DIR)/audio/luts.c
-endif
-
 ifeq ($(strip $(FAUXCLICKY_ENABLE)), yes)
     OPT_DEFS += -DFAUXCLICKY_ENABLE
 	SRC += $(QUANTUM_DIR)/fauxclicky.c