Use-after-free in 2.0.0 under icalrecur_iterator_new()

[Milan Crha]

On Wed, 2016-02-10 at 18:48 +0100, Milan Crha wrote:
> I'm using libical 2.0.0 for testing and such and I realized that it's
> easy to let the application

	Hi,
please find the attached proposed patch for the issue.

It defines a new private pool of strings being used
for icalrecurrencetype::rscale. As the pool is shared by all threads,
it is safe to pass the values between them.

The change fixed it for me, but I do not know whether it's good also
for you. Please let me know.

If accepted, I guess it would be good to make a release, 2.0.1 (or
2.0.0.1?) with all the changes since 2.0.0 release, because some of
them were critical (like the build break and eventually this one).
	Thanks and bye,
	Milan
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