qemu-common.h: Update copyright string to 2021

Update the common copyright string that we use in
-version reports, About dialogs, etc, to 2021.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210309162258.28633-1-peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

include/qemu-common.h

@@ -13,7 +13,7 @@
 #define TFR(expr) do { if ((expr) != -1) break; } while (errno == EINTR)
 
 /* Copyright string for -version arguments, About dialogs, etc */
-#define QEMU_COPYRIGHT "Copyright (c) 2003-2020 " \
+#define QEMU_COPYRIGHT "Copyright (c) 2003-2021 " \
     "Fabrice Bellard and the QEMU Project developers"
 
 /* Bug reporting information for --help arguments, About dialogs, etc */