regex: if PCRE is 8.34 or later, disable auto-possessification for DFA
regex: if PCRE is 8.34 or later, disable auto-possessification for DFA

Normally, recent PCRE behaves as if certain patterns were replaced
by a more "possessive" pattern that gives the same answer for normal
regex matching, but is more efficient. However, the modified pattern
produces fewer results under DFA. If we want the full set of results
we have to apply PCRE_NO_AUTO_POSSESS, and that's a compile-time flag.

This currently only affects a system PCRE, but would also work fine for
an internal PCRE 8.34 or later if the embedded copy is updated.

Bug: https://bugzilla.gnome.org/show_bug.cgi?id=733325
Reviewed-by: Christian Persch <5ec9fa1e687c83cf8ac6835f321fbd490139b07c@gnome.org>

ieei/glib,mzabaluev/glib,johne53/MB3Glib,johne53/MB3Glib,MathieuDuponchelle/glib,Distrotech/glib,MathieuDuponchelle/glib,gale320/glib,ieei/glib,endlessm/glib,tchakabam/glib,tchakabam/glib,ieei/glib,cention-sany/glib,MathieuDuponchelle/glib,krichter722/glib,krichter722/glib,gale320/glib,krichter722/glib,cention-sany/glib,gale320/glib,cention-sany/glib,ieei/glib,tamaskenez/glib,endlessm/glib,mzabaluev/glib,tamaskenez/glib,gale320/glib,johne53/MB3Glib,Distrotech/glib,endlessm/glib,mzabaluev/glib,krichter722/glib,gale320/glib,johne53/MB3Glib,johne53/MB3Glib,tamaskenez/glib,tchakabam/glib,tamaskenez/glib,cention-sany/glib,Distrotech/glib,tchakabam/glib,endlessm/glib,mzabaluev/glib,cention-sany/glib,ieei/glib,endlessm/glib,tamaskenez/glib,MathieuDuponchelle/glib,tchakabam/glib,mzabaluev/glib,MathieuDuponchelle/glib,johne53/MB3Glib,Distrotech/glib,Distrotech/glib,krichter722/glib