Xcode 13.0 breaks test RunCMake.XcodeProject XcodeSchemaGeneration case
As seen in this job, 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 }