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mac_upload_clang had set static version of xcode to use. This
change removes these static properties such that it uses a version
of xcode calculated from the OS in the osx_sdk recipe module.

Bug: 1137520
Change-Id: Ia184c03abad326656989402655645938437d37e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468236
Commit-Queue: Jeff Yoon <jeffyoon@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816614}