[Feature request] git config - includeif - resolve symlinks using realpath

[Lamy Geier <lamyergeier@xxxxxxxxx>]

Hello

It will be useful if the path in includeIf "gitdir" uses the resolved path.

For example, in the following snippet, ~/Documents/Git/Wiki is symlinked 
to several different locations. When using git from other locations, the 
following won't get included. I verified this using `git config --list 
--show-origin --show-scope`

```
[includeIf "gitdir:~/Documents/Git/Wiki/"]
	path = ~/Documents/Git/Wiki/.gitconfig
```

Feature request: Please resolve the path, before using it.

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Thanks and Regards

Lamy