Add a rpath to rkcommon

Mathieu Westphal (Kitware)requested to merge
mwestphal/common-superbuild:fixup_rkcommon into master

rkcommon is generated without a rpath at runtime, adding an option to make sure it has a valid one to be used by fixup_bundle during packaging.

related to paraview-superbuild#236

Edited by Mathieu Westphal (Kitware)

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