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/14.crt b/tests/data_files/dir-maxpath/14.crt
new file mode 100644
index 0000000..5ca323c
--- /dev/null
+++ b/tests/data_files/dir-maxpath/14.crt
@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----