re2: Remove rename POSIX patch.
It should not be necessary anymore.
We fixed the code that was making this necessary in WebRTC and Chromium.
Chromium: https://chromium.googlesource.com/chromium/src/+/
3891bacf18a0fc5dfec32afc67c741728f8f1398
WebRTC: https://chromium.googlesource.com/external/webrtc/+/
91543731c3a850dcc52ae63be8cc257e507fb72d
chromium-dev discussion: https://groups.google.com/a/chromium.org/d/topic/chromium-dev/UXCHnX7pV44/discussion
BUG=169844
R=thakis@chromium.org
TBR=cpu@chromium.org
Review URL: https://codereview.chromium.org/
1086753005
Cr-Commit-Position: refs/heads/master@{#326351}