Avoid the Chocolatey install of Bazel(isk) getting in the way.

Change-Id: Ie99114e4f7cdd9e8d2bff05a810a66f2c09971a2
Reviewed-on: https://code-review.googlesource.com/c/re2/+/61593
Reviewed-by: Perry Lorier <perryl@google.com>
Reviewed-by: Paul Wankadia <junyer@google.com>