Implemented building with clang and transferred control on compilation flags back to CMake#1

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KOLANICH-libs:clang

Commits on Feb 24, 2023

Implementing building with CLang (broken by now because of emitting LLVM bitcode in the case of LTO, https://github.com/llvm/llvm-project/issues/55940) and "improved" building with AVR-gcc - no mor…
KOLANICH
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