Leading slash exclusion does not with git clean on Windows

[Adam Kapos <adam@yousician.com>]

I came across an issue where the leading slash exclusion pattern does
not work with git clean on Windows.

What did you do before the bug happened? (Steps to reproduce your issue)

Run the following commands:
1. mkdir foo
2. mkdir -p bar/foo
3. git clean -fdx --exclude /foo

What did you expect to happen? (Expected behavior)
The root-level directory is not removed because it's excluded

Removing bar/

What happened instead? (Actual behavior)
The root level directory is removed:

Removing bar/
Removing foo/


What's different between what you expected and what actually happened?
The root-level exclusion doesn't work

Anything else you want to add:

Please review the rest of the bug report below.
You can delete any lines you don't wish to share.


[System Info]
git version:
git version 2.35.1.windows.2, 2.31.1.windows.1
cpu: x86_64
built from commit: c5f0be26a7e3846e3b6268d1c6c4800d838c6bbb
sizeof-long: 4
sizeof-size_t: 8
shell-path: /bin/sh
feature: fsmonitor--daemon
uname: Windows 10.0 22000
compiler info: gnuc: 10.2
libc info: no libc information available
$SHELL (typically, interactive shell): C:\Program Files\Git\usr\bin\bash.exe


[Enabled Hooks]
post-commit
post-checkout
post-merge
pre-push

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