[PATCH 4/4] ld.so: Add --list-tunables to print tunable values

[Florian Weimer]

* H. J. Lu:

> Pass --list-tunables to ld.so to print tunables with min and max values.

The code changes look good to me.  Not sure about the NEWS entry and
what conventions we want to use there.

Thanks,
Florian
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