Fix build with GCC < 11: [[fallthrough]] is supported but not allowed in C#294

thiagomacieira merged 1 commit intointel:mainintel/tinycbor:mainfrom

thiagomacieira:Fix_build_with_GCC_11_fallthrough_is_supported_but_not_allowed_in_Cthiagomacieira/tinycbor:Fix_build_with_GCC_11_fallthrough_is_supported_but_not_allowed_in_CCopy head branch name to clipboard