Add LLVM-12 Binaries and Update Build Compatibility in CMake 3.19

Add llvm-12 binaries name to search in cmake scripts. Implicit constants conversions to mute clang warnings. Updated submodules to build with CMake 3.19. Mute recursion in macro expansion in readpassphrase library. Deprecated -fuse-ld changed to --ld-path for clang. #21597 (Ilya Yatsishin).