hdf5_der

[svn-r20797] Resolved failures on bsd machines by modifying configure.in to not add 
-D_POSIX_C_SOURCE=199309L to CC flags for BSD.

Updated to trunk revision r20795.

Tested phoenix (serial -- aio and aio with error recovery)
       jam (serial -- gcc, intel, pgi, aio force on and off)
       freedom & loyalty (serial)