Other platforms that have flutter support use clang to build the flutter-engine
recipe, so do the same with the ccmp15. meta-flutter uses clang for a set of
its recipes (mainly flutter-engine) as long as meta-clang is in the bblayers,
so all we need to do is add said layer.
Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>
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