minor cleanup and adding audio.h reference

src/inputdevice.cpp

@@ -34,6 +34,7 @@
 #include "gui.h"
 #include "savestate.h"
 #include "autoconf.h"
+#include "audio.h"
 #include "sounddep/sound.h"
 #include "disk.h"
 #include "amiberry_gfx.h"

src/osdep/amiberry_gfx.cpp

@@ -29,6 +29,7 @@
 
 #include "gfxboard.h"
 #include "statusline.h"
+#include "audio.h"
 #include "sounddep/sound.h"
 #include "threaddep/thread.h"
 static uae_thread_id display_tid = nullptr;

src/osdep/amiberry_gui.cpp

@@ -18,6 +18,7 @@
 #include "rommgr.h"
 #include "custom.h"
 #include "inputdevice.h"
+#include "audio.h"
 #include "sounddep/sound.h"
 #include "savestate.h"
 #include "blkdev.h"

src/osdep/gui/PanelSound.cpp

@@ -9,6 +9,7 @@
 #include "sysdeps.h"
 #include "options.h"
 #include "gui_handling.h"
+#include "audio.h"
 #include "sounddep/sound.h"