Add a version of flock that uses the fnctl based lockf locking instead of
flock based locks. This allows us to take the same lock that opkg would
use from a shell script. The two different locking mechanisms operate
independently of each other.
Inserting this C file into the util-linux build seems like the easiest/best
place to insert the code. At this point it hasn't been discussed with upstream.
(From OE-Core rev: d2b784110e2c3df8a0a41e4819cf2de9003f9fa3)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
4e6a20efa9