Automatically generate tests/opt-testcases/tls13-compat.sh

`tests/opt-testcases/tls13-compat.sh` is supposed to be automatically
generated by `tests/scripts/generate_tls13_compat_tests.py`. So far, the
output has been updated by running the script manually and committing the
output. Switch to using our framework for generated files.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/scripts/make_generated_files.bat b/scripts/make_generated_files.bat
index b03bce2..b156baa 100644
--- a/scripts/make_generated_files.bat
+++ b/scripts/make_generated_files.bat
@@ -16,3 +16,4 @@
 python framework\scripts\generate_psa_tests.py || exit /b 1

 python framework\scripts\generate_test_keys.py --output tests\src\test_keys.h || exit /b 1

 python framework\scripts\generate_test_cert_macros.py --output tests\src\test_certs.h || exit /b 1

+python tests\scripts\generate_tls13_compat_tests.py || exit /b 1