message: Add #include guard to cashlib.h
diff: // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  +#ifndef CASHLIB_H
  +#define CASHLIB_H
  +
  #include "stdint.h"
  /** Convert binary data to a hex string. The provided result buffer must be 2*length+1 bytes.
  */
  @@ -39,3 +42,4 @@ extern void hash160(const unsigned char* data, unsigned char len, unsigned char*
  /** Return random bytes from cryptographically acceptable random sources */
  extern int RandomBytes(unsigned char *buf, int num);
  +#endif /* CASHLIB_H */
  