update to pcre 8.35+
Submitted by Christian Persch
PCRE 8.32 has just been released. Apart from many bug fixes, it has improved unicode case-insensitive matching, and now supports \X.
The update is not trivial since it depends on bug 684222 for the unicode grapheme cluster data, and it also will also need to access the internal special casing table from glib. I may have to rewrite how PCRE accesses the glib unicode data for that...