Gratuitous gcry_fast_random_poll

[Florian Weimer]

* Werner Koch:

> This call to fast_random_poll() is there on purpose as the comment
> describes.  Without that people will very likely forget to add a
> couple of poll clals and we better make sure that they are at least
> used from time to time.

Sorry, those people won't be able to write decent crypto software
anyway. 8-/ Maybe it's better to check that the appropriate minimum
number of calls is being made and abort() if necessary.

Some fast_random_poll() call in GnuPG is also a bottleneck during
signature verification.  (I think I've already reported that.)

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