Added submodule contents into tree

externals/mbedtls/tests/include/alt-dummy/ecjpake_alt.h

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+/* ecjpake_alt.h with dummy types for MBEDTLS_ECJPAKE_ALT */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#ifndef ECJPAKE_ALT_H
+#define ECJPAKE_ALT_H
+
+typedef struct mbedtls_ecjpake_context {
+    int dummy;
+} mbedtls_ecjpake_context;
+
+
+#endif /* ecjpake_alt.h */