add missing include of vfd header

Origin commit data
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Commit: 3845feb0e4
Author: vanhofen <vanhofen@gmx.de>
Date: 2013-11-13 (Wed, 13 Nov 2013)

Origin message was:
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- add missing include of vfd header

src/gui/audiomute.cpp

@@ -34,6 +34,8 @@
 #include <gui/volumebar.h>
 #include <gui/audiomute.h>
 
+#include <driver/vfd.h>
+
 CAudioMute::CAudioMute():CComponentsPicture(0, 0, 0, 0, NEUTRINO_ICON_BUTTON_MUTE)
 {
 	y_old			= -1;