add vmod-std to the build

[Andrea Campi]

Also, eventually it would be nice not to require a checked out tree.
The tricky part is doing it in such a way that e.g. vmod.py emits correct
includes when building in-tree (e.g. #include "bin/varnishd/cache.h") and
out (e.g. #include <varnish/cache.h> or include <varnish/private/cache.h>
or something like that).
I guess it all depends on how private you want to keep some of the header
files.

Andrea
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