configure: don't check for sendfile

sendfile has been supported since Linux 2.2 and glibc 2.1.

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