[PATCH] Add PCRE support

[Tollef Fog Heen]

]] "Poul-Henning Kamp" 

| 	We will add a "vre.c" file to libvarnish, and all the varnish
| 	code will call vre_comp(), vre_exec() etc. functions from
| 	there.
| 
| 	By default, this file will simply call PCRE functions, and
| 	as shipped Varnish will depend in PCRE.
| 
| 	If somebody for reasons of policy does not want to use PCRE,
| 	they will only have to change the vre.c file to do so.

I've done that in the attached patch.  If somebody could please read
through it an ack it, that would be most appreciated.

-- 
Tollef Fog Heen 
Redpill Linpro -- Changing the game!
t: +47 21 54 41 73
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