LuxRender renamed luxcorerender

Upstream LuxRender changed its name to LuxCoreRender. The source package
is submitted for re-review
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Massive cleanup  from the old LuxRender.spec is done. It does not
include the new macros found on the development release yet but it is
easy setup in that mind. A strange bug during the build triggered a DUP
FUNXC as highlighted on
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