RFC: Check GLIBC_IFUNC to enable/disable ifunc features

[Mike Frysinger]

should have a comment or two mentioning why you need to code all of
these things ad-hoc

also needs a manual update

seems like the feature compare is case-sensitive ?  but some of the
feature strings are inconsistent case ?  would be nice if they were
standardized (like all lower case).
-mike
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