message: Add EXCLUSIVE_LOCKS_REQUIRED to CWallet::ListCoins
  Suggested by MarcoFalke in
diff: @@ -821,7 +821,7 @@ public:
  /**
  * Return list of available coins and locked coins grouped by non-change output address.
  */
  - std::map<CTxDestination, std::vector<COutput>> ListCoins() const;
  + std::map<CTxDestination, std::vector<COutput>> ListCoins() const EXCLUSIVE_LOCKS_REQUIRED(cs_main, cs_wallet);
  /**
  * Find non-change parent output.
  