Xcode 13.0 breaks test RunCMake.XcodeProject XcodeSchemaGeneration case
As seen in [this job](https://gitlab.kitware.com/brad.king/cmake/-/jobs/6205116), the case fails because there is unexpected content printed by the build tool to stderr: ``` --- xcodebuild: WARNING: Using the first of multiple matching destinations: { platform:macOS, arch:arm64, id:00008103-000A35890CD1001E } { platform:macOS, name:Any Mac } ```
issue