[patch]real2int std_vmod function.

[Arianna Aondio]

Hi,
as discussed this afternoon on IRC with Federico, here is a patch for a
std_vmod function for converting from real to int.
we might be interested in pushing this into master.

-- 
Arianna Aondio
Software Developer | Varnish Software AS
Mobile: +47 98062619
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www.varnish-software.com
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