According to oe-core commit

8e26252b45 layer.conf: Extend recipes not to install without explict dependencies

pkgconfig-native is not deployed in sysroot by default any more. Inherit
pkgconfig.bbclass to make it available for ceph.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>