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Rob Latham authored Feb 17, 2015 and Kenneth Raffenetti committed Feb 25, 2015

We can test at configure-time if pread/pwrite is available.
XOPEN_SOURCE set low enough will not provide this feature, for example
(as is the case with --enable-strict).
Signed-off-by: Ken Raffenetti <raffenet@mcs.anl.gov>