nsswitch: do not reload if "/" changes

[Florian Weimer]

* DJ Delorie:

>> Hmm.  Upon second thought, I think this need to be made fail-closed by
>> disabling reload on stat failure.  The two things aren't as unrelated as
>> one might think (chroot + truning on some security filter doesn't seem
>> to be uncommon).  Now of course it's a bit unlikely that anything can be
>> loaded later if / can't be read, but is there a harm in macking this
>> explicity?
>
> Can we reuse the reloadable flag?

The above is about a second issue, disabling reloading in case of stat
failure.  It's independent whether we disable DSO loading or not.

> Or do we need a second independent flag just for dll reloading?  IIRC
> we also use the reloadable flag for test cases that override
> nsswitch.conf, so I would guess no.

I think we could reuse the flag.

Thanks,
Florian
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