[scripts] Replace old clang-format script

Test: ./scripts/clang-fmt <some file> and ./scripts/clang-fmt --version
Change-Id: Ic8c8a830e3914dc0eba9b05abf4d9a8d5dac2e12

.gitignore

@@ -13,7 +13,6 @@ t
 blk.bin
 *.dSYM
 scripts/toolpaths.local
-clang-format
 compile_commands.json
 .vscode
 *_BACKUP_*

scripts/clang-fmt

@@ -6,17 +6,8 @@
 # license that can be found in the LICENSE file or at
 # https://opensource.org/licenses/MIT
 
-SCRIPTSDIR=`dirname $0`
-CLANGFMT=$SCRIPTSDIR/clang-format
+ZIRCON_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+CLANG_DIR="${ZIRCON_ROOT}/prebuilt/downloads/clang/bin"
+CLANG_FMT="${CLANG_DIR}/clang-format"
 
-if [ ! -f "$CLANGFMT" ]; then
-  echo "local clang-format not found. Running scripts/fetch-clang-fmt to get it."
-  ( cd $SCRIPTSDIR && ./fetch-clang-fmt )
-fi
-
-if [ ! -f $CLANGFMT ]; then
-  echo "$CLANGFMT still not found. Exiting."
-  exit 0
-fi
-
-$CLANGFMT -i -style=file $@
+exec "$CLANG_FMT" -i -style=file "$@"

scripts/fetch-clang-fmt

-#!/bin/sh
-
-# Copyright 2016 The Fuchsia Authors
-#
-# Use of this source code is governed by a MIT-style
-# license that can be found in the LICENSE file or at
-# https://opensource.org/licenses/MIT
-
-HASH=
-
-# hashes saved from
-#
-# https://chromium.googlesource.com/chromium/buildtools/+/master/linux64/clang-format.sha1
-# https://chromium.googlesource.com/chromium/buildtools/+/master/mac/clang-format.sha1
-
-case `uname` in
-Linux)
-    HASH=8b68e8093516183b8f38626740eeaff97f112f7e
-    ;;
-Darwin)
-    HASH=afe0942b94fe33619361efe1510ae081c3070dc1
-    ;;
-*)
-    echo "OS not understood"
-    exit 1
-esac
-
-if [ -f clang-format ]; then
-    echo "clang-format already exists in local directory"
-    exit 1
-fi
-
-# fetch clang-format into the local directory
-curl https://storage.googleapis.com/chromium-clang-format/$HASH > clang-format.fetch &&
-chmod +x clang-format.fetch &&
-mv clang-format.fetch clang-format