Add pkgconfig to rpm spec
Add pkgconfig to rpm spec

pkgconfig file is installed but not referenced in the
rpm's spec file so rpmbuild fails.

Signed-off-by: Hrvoje Zeba <7fe4299605bef6b9e0a6010f440e7caed6591bdc@gmail.com>
Signed-off-by: Jens Axboe <cd8c6775e60d6f67a6984377324e5290df3d5358@kernel.dk>

axboe/liburing,axboe/liburing,axboe/liburing