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[CI] Do not re-download the OSX SDK if it's already available

Description

[CI] Do not re-download the OSX SDK if it's already available

Summary: This improves build time and bandwidth usage for the OSX gitian build on CI.

Test Plan: OSX Gitian build on CI

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D5515