Matthew Macy d46f0deb03 Add wrapper for Linux BLKFLSBUF ioctl
FreeBSD has no analog. Buffered block devices were removed a decade
plus ago.

Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Reviewed-by: Jorgen Lundman <lundman@lundman.net>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Closes #9508
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