Disable bootloader messages in the ipod bootloader unless the RIGHT button is being held.  Messages are still displayed if an error occurs.  This needs implementing for the other bootloaders.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12631 a1c6a512-1295-4272-9138-f99709370657
diff --git a/bootloader/common.h b/bootloader/common.h
index 7e001aa..c72952e 100644
--- a/bootloader/common.h
+++ b/bootloader/common.h
@@ -26,6 +26,9 @@
 #define     EBAD_CHKSUM             -5
 #define     EFILE_TOO_BIG           -6
 
+/* Set this to true to enable lcd_update() in the printf function */
+extern bool verbose;
+
 /* Functions common to all bootloaders */
 void reset_screen(void);
 void printf(const char *format, ...);