external-toolchain: use RPROVIDES instead of PKG

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Drop cross-canadian bits for the time being

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
linux-libc-headers: drop recipe we aren't using at the moment

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
oprofile-external: update to current class, fix

Signed-off-by: Christopher Larson <chris_larson@mentor.com>