Add C++ interface to HDF5 build

[Dr15Jones]

This is accomplished by adding '--enable-cxx' to the configuration. This will generate an additional library so we may need an additional scram tool to specify when to link with that library.

[cmsbuild]

A new Issue was created by @Dr15Jones Chris Jones.

@Dr15Jones, @perrotta, @dpiparo, @rappoccio, @makortel, @smuzaffar can you please review it and eventually sign/assign? Thanks.

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[Dr15Jones]

assign core

[cmsbuild]

New categories assigned: core

@Dr15Jones,@smuzaffar,@makortel you have been requested to review this Pull request/Issue and eventually sign? Thanks

[smuzaffar]

thanks @Dr15Jones, I am on it

[smuzaffar]

#8541 should enable the cxx interface.