Merge topic 'ninja-multi-test-fix' into release-3.21

Tests/RunCMake/NinjaMultiConfig/RunCMakeTest.cmake

...Make/NinjaMultiConfig/Simple-all-subdir-build-check.cmake

...unCMake/NinjaMultiConfig/Simple-all-top-ninja-check.cmake

...ig/Simple-debug-in-release-graph-target-ninja-check.cmake

...onfig/Simple-debug-in-release-graph-top-build-check.cmake

...ke/NinjaMultiConfig/Simple-debug-subdir-build-check.cmake

...ltiConfig/Simple-default-build-file-all-ninja-check.cmake

...ple-default-build-file-clean-minsizerel-ninja-check.cmake

...iConfig/Simple-default-build-file-clean-ninja-check.cmake

.../NinjaMultiConfig/Simple-minsizerel-top-ninja-check.cmake

...mple-release-in-minsizerel-graph-subdir-ninja-check.cmake

...leCrossConfigs-all-all-in-release-graph-build-check.cmake

...igs-all-relwithdebinfo-in-release-graph-build-check.cmake

...MultiConfig/SimpleDefaultBuildAlias-all-ninja-check.cmake

...SimpleDefaultBuildAliasList-all-configs-build-check.cmake

...efaultBuildAliasList-all-relwithdebinfo-ninja-check.cmake

...mpleDefaultBuildAliasList-clean-configs-ninja-check.cmake

Tests/RunCMake/NinjaMultiConfig/SimpleSubdir/CMakeLists.txt