Fix some more #includes

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18522 a1c6a512-1295-4272-9138-f99709370657

firmware/backlight.c

@@ -860,7 +860,6 @@ void backlight_init(void)
 
 void backlight_on(void) {}
 void backlight_off(void) {}
-void buttonlight_on(void) {}
 void backlight_set_timeout(int value) {(void)value;}
 
 bool is_backlight_on(bool ignore_always_off)

firmware/drivers/audio/wm8975.c

@@ -29,6 +29,7 @@
 #include "system.h"
 #include "string.h"
 #include "audio.h"
+#include "sound.h"
 
 #include "wmcodec.h"
 #include "audiohw.h"

firmware/target/sh/archos/ondio/usb-ondio.c

@@ -26,6 +26,7 @@
 #include "hwcompat.h"
 #include "system.h"
 #include "usb.h"
+#include "usb-target.h"
 
 int usb_detect(void)
 {