add enum value to string helpers

Only add helpers for enum in `ssl.h`.

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/tests/scripts/check-generated-files.sh b/tests/scripts/check-generated-files.sh
index 0399484..994fd24 100755
--- a/tests/scripts/check-generated-files.sh
+++ b/tests/scripts/check-generated-files.sh
@@ -118,6 +118,7 @@
 check scripts/generate_errors.pl library/error.c
 check scripts/generate_query_config.pl programs/test/query_config.c
 check scripts/generate_features.pl library/version_features.c
+check scripts/generate_ssl_debug_helpers.py library/ssl_debug_helpers_generated.c
 # generate_visualc_files enumerates source files (library/*.c). It doesn't
 # care about their content, but the files must exist. So it must run after
 # the step that creates or updates these files.