Suppres CC_MD5 warning (#47378)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/47378

The RCTMD5Hash in RCTUtils is using CC_MD5 function which is deprecated. unfortunately we can't really change it or we will break many apps that use it in the AsyncStorage.

Those app wlll have to do a migration to use a different function. Meanwhile we are suppressing the warning

## Changelog
[Internal] - Suppress CC_MD5 warning

Reviewed By: cortinico

Differential Revision: D65424309

fbshipit-source-id: e0258ae68482f6c4a3a865bb52920f87bc5ada21