[poky] libc configuration of multilib config

[Jonathan Richardson]

you might want to look into multi config feature.
https://www.yoctoproject.org/docs/2.3/dev-manual/dev-manual.html#platdev-building-targets-with-multiple-configurations
https://wiki.yoctoproject.org/wiki/TipsAndTricks/BuildingZephyrImages#Arduino_101_and_Multiconfig

Not sure how I missed this section but it's exactly what I need. It's nice
that we
can configure it automatically without manually changing the MACHINE
variable
as well. Thanks Khem/Richard.