Detect requirement on DTLS_BADMAC_LIMIT

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index bdf1daa..419001a 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -320,6 +320,11 @@
     esac
 
     case " $1 " in
+        *\ badmac_limit=*)
+            requires_config_enabled MBEDTLS_SSL_DTLS_BADMAC_LIMIT;;
+    esac
+
+    case " $1 " in
         *\ fallback=1\ *|*\ -fallback_scsv\ *)
             requires_config_enabled MBEDTLS_SSL_FALLBACK_SCSV;;
     esac