git update-index not delete lock file when using different worktree

This is a [issue from TortoiseGit](https://code.google.com/p/tortoisegit/issues/detail?id=2233). After doing some test, I report it here. The following is the testing information I have tested.

### Folder Structure
```
Test
  |-- myrepo
  |     |-- bar.txt
  |     |-- foo.txt
  |
  |-- myrepo.git
        |-- .git
```
Testing repository is
[here](https://code.google.com/p/tortoisegit/issues/detail?id=2233#c2).

### Using different worktree
Set the config file (in the .git folder)
```
[core]
	worktree = ../../myrepo
```

### Test 1 - Git Bash ``` User@PC /d/Repo/myrepo.git (master) $ git --version git version 1.9.4.msysgit.0

User@PC /d/Repo/myrepo.git (master) $ git update-index --refresh fatal: Unable to write new index file ``` D:\Repo\myrepo.git\\**index.lock** is not deleted.

### Test 2 - Git 2.0.0 Copy testing repository into ```C:\msysgit\MyTest```

Execute```msys.bat``` ```$ vagrant up``` ```$ vagrant ssh``` ```vagrant@precise64:/vagrant/git$ cd /vagrant``` ```vagrant@precise64:/vagrant$ cd mytest/myrepo.git``` ``` vagrant@precise64:/vagrant/mytest/myrepo.git$ git --version git version 2.0.0 ``` ``` vagrant@precise64:/vagrant/mytest/myrepo.git$ git update-index --refresh fatal: Unable to write new index file ``` Also, **index.lock is not deleted.**

### Test 3 - gitdll of TortoiseGit (git version 1.9.0) Tracing the source code into **compat/mingw.c** line 289 : xutftowcs_canonical_path() get the value of var. wpathname ``` D:\Repo\myrepo\.git\index.lock ``` It should be ``` D:\Repo\myrepo.git\.git\index.lock ```

line 294 : _wunlink() try to delete the file.(```D:\Repo\myrepo\.git\index.lock```) line 295 : GetLastError() return 3(ERROR_PATH_NOT_FOUND) (Actually, there is no ```D:\Repo\myrepo\.git``` folder.)

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