tree db0ebcf0e1378824fb22a8d431b19d9aef6651a3
parent 434b95e829a08ae7489b790eeb783e7953295571
author Bill Hollings <bill.hollings@brenwill.com> 1619896917 -0400
committer Bill Hollings <bill.hollings@brenwill.com> 1619896917 -0400

Further fixes to Xcode 12.5 support.

Test for [MTLDevice supportsBCTextureCompression] only when using Xcode 12 and above.
Use Xcode 12.5 in GitHub Actions CI.
Fix typos in comments.