[buildtools] Remove non-arch-specific mac clang-format

In preparation for using clang-format binaries built in clang rolls
which will result in per-arch clang-format executables
https://crrev.com/c/3533408 added the corresponding mac per-arch sha1
files. This change deletes the old mac clang-format.sha1.

If your project DEPS uses this mac clang-format.sha1, follow
https://crrev.com/c/3533408/2/DEPS
and use the mac x64/arm64 clang-format sha1 files.

Bug: 1286289
Change-Id: I1d4ae909730c986f65b6afa5bb08bacae4803569
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3540820
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Arthur Eubanks <aeubanks@google.com>
Cr-Commit-Position: refs/heads/main@{#983388}
NOKEYCHECK=True
GitOrigin-RevId: eb5a8b06c76a6ee63b80066f51c8885b0a075b17
diff --git a/mac/clang-format.sha1 b/mac/clang-format.sha1
deleted file mode 100644
index 6b3f7a9..0000000
--- a/mac/clang-format.sha1
+++ /dev/null
@@ -1 +0,0 @@
-5ba974b3b37f9f4e3b44fdde11d7ef2ab71619ab