Pass mac_xcode_version parameter

Bug: chromium:1110824
Change-Id: I77835942a81b6430ec23c16fa41dabac857e8c22
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2343079Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Almothana Athamneh <almuthanna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69293}

DEPS

@@ -477,7 +477,8 @@ hooks = [
     'name': 'mac_toolchain',
     'pattern': '.',
     'condition': 'checkout_mac',
-    'action': ['python', 'build/mac_toolchain.py'],
+    'action': ['python', 'build/mac_toolchain.py',
+               '--xcode-version', Var('mac_xcode_version')],
   },
   # Pull binutils for linux, enabled debug fission for faster linking /
   # debugging when used with clang on Ubuntu Precise.