Bundled git is not executable on Mac

[CapnRat]

First time installation of the bundled git does not correctly set the file permissions to executable. This results in Access Denied errors for all git process operations.

Repo Steps:

• Ensure there is no /Users/<user>/Library/Application Support/GitForUnity/ directory.
• Add the Git For Unity package to a brand new Unity project with no initialized git repo.
• Note that git config settings are not pre-filled out in the settings view. And if you try to add name/email it will silently fail on save.
• Check the git-for-unity.log and notice all the Access Denied errors.
• Switching to system git makes the package usable again.