Import code from previous AssetBuilder version

thirdparty/libtomcrypt/misc/zeromem.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"
+
+/**
+   @file zeromem.c
+   Zero a block of memory, Tom St Denis
+*/
+
+/**
+   Zero a block of memory
+   @param out    The destination of the area to zero
+   @param outlen The length of the area to zero (octets)
+*/
+void zeromem(volatile void *out, size_t outlen)
+{
+   volatile char *mem = out;
+   LTC_ARGCHKVD(out != NULL);
+   while (outlen-- > 0) {
+      *mem++ = '\0';
+   }
+}
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */