[tools] Add git.bat to search list

On Windows, with depot_tools, git might be a batch file called
git.bat. Add that to the default search list to make it easier
to find a git command.

Change-Id: I825432e0f7fc72c37a1f2394a68e2f3f3e65f958
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/497056
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Dominik Röttsches <drott@google.com>
1 file changed