#2512: Enable detection of `attribute(pure)`

Reporter:	Erik Schnetter
Status:	new
Milestone:
Version:	development version
Type:	proposal
Priority:	minor
Component:	Cactus

Comment (by Roland Haas):

I will re-enable CCTK_ATTRIBUTE_PURE shortly after the 2021_11 release so that we can test if this breaks anything.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2512/enable-detection-of-attribute-pure