Support .git symlinks

[tdfischer]

For large projects that use google's 'repo' tool, .git is actually a symlink to somewhere else. lstat() only reads the symlink itself, not the target of the symlink, leading to errors like EISDIR: illegal operation on a directory, read

Description

That's about it. Not a lot of details here.

Motivation and Context

Fixes commitlint usage for repo-based projects (eg, yocto builds)

Usage examples

Clone a set of yocto layers using repo, try to use commitlint.

How Has This Been Tested?

Patched the module locally, commitlint started working.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.