message: script: Disallow silent bool -> CScript conversion
diff: @@ -435,7 +435,7 @@ public:
  return ret;
  }
  - CScript(int64_t b) { operator<<(b); }
  + explicit CScript(int64_t b) { operator<<(b); }
  explicit CScript(opcodetype b) { operator<<(b); }
  explicit CScript(const CScriptNum& b) { operator<<(b); }
  