Import code from previous AssetBuilder version

thirdparty/libtomcrypt/pk/dh/dh_free.c

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+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ */
+
+#include "tomcrypt.h"
+
+#ifdef LTC_MDH
+
+/**
+  Free the allocated ram for a DH key
+  @param key   The key which you wish to free
+*/
+void dh_free(dh_key *key)
+{
+   LTC_ARGCHKVD(key != NULL);
+   mp_cleanup_multi(&key->prime, &key->base, &key->y, &key->x, NULL);
+}
+
+#endif /* LTC_MDH */
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */