[Varnish] #1080: Enable use of PCRE JIT-compiled regexes

[Varnish]

#1080: Enable use of PCRE JIT-compiled regexes
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 Reporter:  toofishes  |        Type:  enhancement
   Status:  new        |    Priority:  normal     
Milestone:             |   Component:  build      
  Version:  trunk      |    Severity:  normal     
 Keywords:             |  
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 As subject. I think I got this right and it still should be backward
 compatible for pre-8.20 libpcre versions.

 Note that pcre_compile() is also used in cache_ban.c, but I did not touch
 that with this patch.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1080>
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