Make Xdmf optional
This removes required dependencies for hdf5 and libxml2 by making Xdmf output optional.
Xdmf has to be enabled explicitly by setting OGS_USE_XDMF=ON
.
This should at least bypass some build errors for some people.
cc: @TobiasMeisel, @nagelt, @dominik-kern
Closes #3066 (closed).
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Feature description was added to the changelog -
Tests covering your feature were added?