Bump macOS SDK version to 10.13 for gitian builds #14797

1. 
   hebasto commented at 3:08 pm on November 24, 2018: member

   http://doc-snapshots.qt.io/qt5-5.12/macos.html#supported-versions

   It seems we must have 10.13+ SDK to build for macOS 10.14 .

2. fanquake added the label macOS on Nov 24, 2018
3. fanquake added the label Build system on Nov 24, 2018
4. 
   fanquake commented at 1:11 am on February 3, 2020: member

   Going to close this, as it’s also being tracked in #16392 and #16052.
5. fanquake closed this on Feb 3, 2020

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6. laanwj referenced this in commit c8ce2632eb on Feb 5, 2020
7. DrahtBot locked this on Feb 15, 2022

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