Made zlib tests ZipTest.UnzipWindowsSpecialNames and
ZipTest.UnzipMixedPaths more lenient on Windows to accommodate different
versions on Windows.

BUG=chromium:1313991
TEST=autoninja -C out/Default zlib_unittests && out/Default/zlib_unittests

Change-Id: I7217629de35d07040cb175327ca51e61f48a6d4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3573798


Reviewed-by: Alex Danilo <adanilo@chromium.org>
Commit-Queue: François Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/main@{#989698}
NOKEYCHECK=True
GitOrigin-RevId: 6ccf672cf8a6b7035cda082db440f97b4edadc86