Axel Huebl authored Nov 08, 2017 and Brad King committed Nov 08, 2017

Fix a typo from commit v3.6.0-rc1~85^2 (HDF5: Refactor the use of
compiler wrappers, 2016-04-04) that accidentally used the HDF5 C++
version (which could be empty) while detecting the C patch version.
The detection failed for patch releases, such as `1.10.0-patch1`
becoming `.1` instead of `1.10.0.1`.