configure: don't check for preadv and pwritev

preadv and pwritev have been supported since Linux 2.6.30.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
6 files changed