Backport patch from pcre 6.2 to fix integer overflows in quantifier

parsing:

* srclib/pcre/pcre.c (read_repeat_counts): Check for integer overflow.

Obtained from: pcre 6.2 upstream


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@233493 13f79535-47bb-0310-9956-ffa450edef68