Merge branch 'backport-3.14-fix-EXCLUDE_FROM_ALL-subdir-all'

Help/prop_dir/EXCLUDE_FROM_ALL.rst

Help/prop_tgt/EXCLUDE_FROM_ALL.rst

Source/cmGlobalGenerator.cxx

Source/cmGlobalGenerator.h

Source/cmGlobalNinjaGenerator.h

Source/cmGlobalUnixMakefileGenerator3.cxx

Source/cmGlobalVisualStudioGenerator.cxx

Source/cmGlobalXCodeGenerator.cxx

Source/cmLocalNinjaGenerator.cxx

Source/cmMakefile.cxx

Tests/RunCMake/RunCMake.cmake

...Make/add_subdirectory/ExcludeFromAll-build-sub-stderr.txt

Tests/RunCMake/add_subdirectory/ExcludeFromAll.cmake

...s/RunCMake/add_subdirectory/ExcludeFromAll/CMakeLists.txt

.../RunCMake/add_subdirectory/ExcludeFromAll/check-sub.cmake

Tests/RunCMake/add_subdirectory/ExcludeFromAll/check.cmake

Tests/RunCMake/add_subdirectory/ExcludeFromAll/subinc.cpp

Tests/RunCMake/add_subdirectory/ExcludeFromAll/zot.cpp

Tests/RunCMake/add_subdirectory/RunCMakeTest.cmake