the core code.

In the future directors belong in VMODs, which takes the need to
hack VCC code out of the learning-curve.

Certain directors have already been moved to VMODs, others will
need a bit of brain-surgery before they go there.

This commit is to get them out of the way for V4

VCL::fini cleanup

Remove a bunch of ifdef code and fix up proper configure check for
libedit.

Fixes #1277

these now live in VMOD.directors (and can be stacked :-)

Fixes #1273

will need.

builtin define for it.

From:	"Federico G. Schwindt" <fgsch@lodoss.net>

it is no longer a demo, it is going to replace the "built-in" rr
director.

Other directors will follow as time permits.

add a test-case where it is used in stackable fashion.

I should have done it this way from the very start, rather than
muck about with director configurations in VCC...

created.

Split the demo-rr director into its own file

to eliminate any chance of collissions.

Check the ABI.  This check may be too strong, but at least its safe.

that purpose.