cross: export CC family from BUILD_* for cross compilers
cross-compilers are native recipes that need to be compiled by the host's
compiler. However they do not use native.bbclass
As a consequence, the various CC, CXX etc environment variables are not
correctly set and they will not honor the host compiler name provided
by the BUILD_* variables.
Signed-off-by: Jérémy Rosen <jeremy.rosen@smile.fr> Signed-off-by: Ross Burton <ross.burton@intel.com>
