Ignoring return value of function declared with 'warn_unused_result' attribute

[JackSteven]

错误：
/toilet/node_modules/react-native/Libraries/WebSocket/RCTSRWebSocket.m:494:3: Ignoring return value of function declared with 'warn_unused_result' attribute

修改：
将
SecRandomCopyBytes(kSecRandomDefault, sizeof(uint32_t), (uint8_t *)mask_key);
修改为
(void)SecRandomCopyBytes(kSecRandomDefault, sizeof(uint32_t), (uint8_t *)mask_key);