Also tweak presubmit checks to allow changes to RTCMacros.h. Bug: webrtc:6471 No-Presubmit: True Change-Id: I19e38e4cb05b831ebd2faa223029f36d45f480ff Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/193621 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Kári Helgason <kthelgason@webrtc.org> Commit-Queue: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32619}