Add test for limit on intermediate certificates

Inspired by test code provided by Nicholas Wilson in PR #351.

The test will fail if someone sets MAX_INTERMEDIATE_CA to a value larger than
18 (default is 8), which is hopefully unlikely and can easily be fixed by
running long.sh again with a larger value if it ever happens.

Current behaviour is suboptimal as flags are not set, but currently the goal
is only to document/test existing behaviour.
diff --git a/tests/data_files/dir-maxpath/09.crt b/tests/data_files/dir-maxpath/09.crt
new file mode 100644
index 0000000..8f67e54
--- /dev/null
+++ b/tests/data_files/dir-maxpath/09.crt
@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----