[PATCH] Move local functions to vsm_int.h

[Poul-Henning Kamp]

In message <20140120155022.GA2667 at nitzer>, "Federico G. Schwindt" writes:

>  VSM__iter0 and VSM__itern are local.  Move the prototypes to vsm_int.h.
>  Tests are still happy.

I think VSM_FOREACH() is part of the official API, so it
shold not go in vsm_int.h, and I think we should keep
the two functions it use with it.

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