Fix issues with separator in hdf5 definitions.

Paul Ferrellrequested to merge
pflarr/common-superbuild:hdf5_def_fix into master

Replace ; list separator with the explicitely defined one '-+-'.

I was getting superbuild failures because the '-DHDF5_DEFINITIONS=' extra cmake args had a bunch of semicolon separated items. This was when trying to build 5.9.0-RC2 server builds.

Edited by Paul Ferrell

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