Just do it. Don’t even dare asking, just do it.
OK then, I’ll explain one more time. A [D]VCS like Git enables asynchronous but still very organized developer contributions, and that’s it. Setting up the file system and its permissions, etc., is part of the deployment process, and thus, a responsibility for its automation. When you allow Git to mess your project’s file permissions scheme god kills a kitten and you can be sure you’ll be accounted for.
Enough talking. Now, from your repository folder, run:
git config core.fileMode false
Also, please make it a global config:
git config --global core.fileMode false
Thank you very much.