pcre update
pcre update

fixes https://github.com/peachpiecompiler/peachpie/issues/537
6-digits Unicode hex sequences

iolevel/peachpie,peachpiecompiler/peachpie,iolevel/peachpie-concept,peachpiecompiler/peachpie,iolevel/peachpie,iolevel/peachpie-concept,iolevel/peachpie-concept,iolevel/peachpie,peachpiecompiler/peachpie