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Goma RBE only supports paths that are relative to the build directory,
and the system Xcode typically resides outside of that, so all
compilation requests fail. The solution is to put a symbolic link to
the SDK in the build directory and reference that instead.

In addition, any files in the SDK referenced as inputs to a GN action
need to be listed as an output of some other GN action, as they are now
considered to be build outputs by way of the symlink in the build
directory. This creates a new //build/config/mac:sdk_inputs target for
those actions to depend on, which lists those files as outputs via
a dummy build rule.

Bug: 1157103
Change-Id: I5f7a1926fc2714c10a8786e100371d3eb9888a05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2582409Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835636}