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Xcode: Work around xcodebuild spurious hangs in try_compile

Brad King requested to merge brad.king/cmake:xcode-try_compile-scheme into master

xcodebuild occasionally hangs on some macOS machines (and can be reproduced independent of CMake). It only happens a few times in 1000 runs, but configuration of a large project calls try_compile many times and therefore frequently hangs due to this problem. I've been unable to reproduce the hang when using a scheme to build, so always generate a scheme in try_compile projects to work around the problem.

Issue: #16752 (closed)

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