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Rob Latham authored Feb 16, 2015 and Kenneth Raffenetti committed Feb 25, 2015

lustre, or specifically the header files lustre brings in (quota.h) show
a problem with caddr_t not being defined if XOPEN_SOURCE is set.  We
provided this define so we could make use of pread/pwrite, but instead
we will use our replacement pread/pwrite if one does not exist.

See #1973
Signed-off-by: Ken Raffenetti <raffenet@mcs.anl.gov>