In a similar manner to cml1.bbclass, we export the pkg-config
variables to allow a direct call to pkg-config access to the
native sysroot versus the target sysroot.
The kernel doesn't use pkg-config for target configuration,
and has many explicit calls to pkg-config, without the
possibility of easy override to pkg-config-native.
The calls to pkg-config could be made cross friendly via
replacement with make variables, but until that effort is
undertaken upstream, we need a bridge approach.
In particular, this is required for dtschema validation,
which is a requirement in kernel 5.16+
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
