[Libguestfs] libguestfs now depends on PCRE2 (instead of PCRE)

[Richard W.M. Jones]

PCRE ("Perl Compatible Regular Expressions") is a required dependency
for libguestfs, guestfs-tools and virt-v2v.  We use it extensively
throughout the code for regular expression stuff, and even maintain
our own OCaml bindings.

The original PCRE (v1) was deprecated upstream a few years ago.  It's
now only maintained for critical bugs.

Therefore I have migrated everything over to PCRE2 -- quite a
significant change actually.  So you'll need to adjust your
dependencies accordingly.  PCRE2 seems to be as widely available as
PCRE (v1) so this shouldn't be a problem, although let me know if it
causes any issues.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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