Kris Thielemans authored Mar 04, 2017 and Brad King committed Mar 06, 2017

Changes in commit v3.8.0-rc1~7^2~5 (FindHDF5: Fix command-line parsing
argument extraction order, 2017-02-02) accidentally dropped `-D` from
preprocessor definition flags extracted from the HDF5 compiler wrappers.

Fixes: #16693