[PATCH v3] addmntent: Remove unbounded alloca usage from getmntent [BZ#27083]

[Florian Weimer]

* Siddhesh Poyarekar via Libc-alpha:

> The addmntent function replicates elements of struct mnt on stack
> using alloca, which is unsafe.  Put characters directly into the
> stream, escaping them as they're being written out.
>
> Also add a test to check all escaped characters with addmntent and
> getmntent.

This version looks okay to me.

Thanks,
Florian
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