ui/console: Get tab completion working again in the SDL monitor vc

Define a QEMU special key constant for the tab key and add an entry for
it in the qcode_to_keysym table. This allows tab completion to work again
in the SDL monitor virtual console, which has been broken ever since the
migration from SDL1 to SDL2.

Signed-off-by: Cal Peake <cp@absolutedigital.net>
Message-Id: <7054816e-99c-7e2-6737-7cf98cc56e2@absolutedigital.net>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/include/ui/console.h b/include/ui/console.h
index c0520c6..e400ee9 100644
--- a/include/ui/console.h
+++ b/include/ui/console.h
@@ -70,6 +70,7 @@
 /* keysym is a unicode code except for special keys (see QEMU_KEY_xxx
    constants) */
 #define QEMU_KEY_ESC1(c) ((c) | 0xe100)
+#define QEMU_KEY_TAB        0x0009
 #define QEMU_KEY_BACKSPACE  0x007f
 #define QEMU_KEY_UP         QEMU_KEY_ESC1('A')
 #define QEMU_KEY_DOWN       QEMU_KEY_ESC1('B')