Bill Hollings f6ba6f2dcc Drop official support for using Xcode 11 to build MoltenVK.
- Remove Xcode 11 build from GitHub CI.
- Leave MVK_XCODE_12 guards in place to allow devs to possibly continue to
  attempt to build existing MoltenVK code using Xcode 11, even though it's
  not officially supported. Such devs may have to add their own additional
  MVK_XCODE_12 guards for any Xcode 12 API features added after this change.
2023-07-12 17:32:58 -04:00
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