etl

64f620c1 - fix c++20-compat false positive (#909)

fix c++20-compat false positive (#909) * fix c++20-compat false positive * move the c++20 compat warning suppression to a separate header * fix GCC/clang in private/diagnostic_cxx_20_compat_push.h --------- Co-authored-by: Jan Dorniak <jdorniak@ultima-automatyka.pl>