Perform A-Label roundtrip for lookup functions by default

Merged Tim Rühsen requested to merge tmp-roundtrip-for-lookups into master

This adds another check to avoid unexpected results. It was a longstanding FIXME.

Thanks to Jonathan Birch of Microsoft Corporation, Florian Weimer (GNU glibc) and Nikos Mavrogiannopoulos (GnuTLS) for investigation, discussion and testing.

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