pcre 8.38: latest patches from upstream (LFS)

pcre 8.38: latest patches from upstream (LFS)

* Fix auto-callout (?# comment bug.
* Fix negated POSIX class within negated overall class UCP bug.
* Fix bug for isolated \E between an item and its qualifier
when auto callout is set.
* Give error for regexec with pmatch=NULL and REG_STARTEND set.
* Allow for up to 32-bit numbers in the ordin() function in  pcregrep.
* Fix \Q\E before qualifier bug when auto callouts are enabled.
* Fix /x bug when pattern starts with white space and (?-x).
* Fix copy named substring bug.
* Fix (by hacking) another length computation issue.
* Fix get_substring_list() bug when \K is used in an assertion.
* Fix pcretest bad behaviour for callout in lookbehind.
* Fix workspace overflow for (*ACCEPT) with deeply nested parentheses.
* Yet another duplicate name bugfix by overestimating the
memory needed  (i.e. another hack - PCRE2 has this "properly" fixed).
* Fix pcretest loop for global matching with an ovector size less than 2.
* Fix non-diagnosis of missing assertion after (?(?C).

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>