Log Message:
cmake: updated to 3.20.2

CMake 3.20.2
* ci: pay attention to the machine load when running tests
* ci: limit builds by machine load
* Help: Add 3.20 release note for error on unknown arguments
* gitlab-ci: equally delay all jobs on integration branches
* Autogen: Restore mocs_compilation in OBJECT libraries
* Help: Fix typos in cmake-compile-features(7)
* Help: Do not recommend WCDH in cmake-compile-features(7)
* Intel: Update Classic compiler version detection for 2021
* IntelLLVM: Add special case for ifx 2021.1 version extraction
* Help: Behavior of file(TO_NATIVE_PATH) depends on the host platform
* Help: Document special cases for if(IS_ABSOLUTE)
* Add missing 'not' in error messages
* KWIML 2021-04-21 (49d91529)
* autogen: fix race in depfile parsing
* Ninja Multi-Config: Correctly generate POST_BUILD custom targets
* BinUtils: Restore toolchain prefix detection from compiler name 'c++'
* OpenBSD: Fix system feature definitions