scripts/tags.sh: fix the Kconfig tags generation when using latest ctags

scripts/tags.sh: fix the Kconfig tags generation when using latest ctags

The Kconfig language has already been built-in in the latest ctags, so it
would error exit if we try to define it as an user-defined language via
'--langdef=kconfig'.  This results that there is no Kconfig tags in the
final tag file.  Fix this by skipping the user Kconfig definition for the
latest ctags.

Link: https://lkml.kernel.org/r/20230128064916.912744-1-haokexin@gmail.com
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Reviewed-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Nicolas Schier <nicolas@fjasle.eu>
Cc: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@gmail.com>
Cc: Vipin Sharma <vipinsh@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>