lint: exclude tags file from codespell

If we build tags for our repo:

[criu]$ make tags
  GEN      tags

And then run codespell, we get an error:

[criu]$ codespell
./tags:3755: struc ==> struct

Let's exclude tags file from codespell search, this would add usability
to `make lint`.

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>

Makefile

@@ -427,7 +427,7 @@ lint:
 	shellcheck -x test/others/libcriu/*.sh
 	shellcheck -x test/others/crit/*.sh test/others/criu-coredump/*.sh
 	shellcheck -x test/others/config-file/*.sh
-	codespell
+	codespell -S tags
 	# Do not append \n to pr_perror or fail
 	! git --no-pager grep -E '^\s*\<(pr_perror|fail)\>.*\\n"'
 	# Do not use %m with pr_perror or fail