php: Fix of 3 CVEs

CVE-2018-5711: Fix infinite loop in gdImageCreateFromGifCtx libgd when reading crafted GIF - CVE-2018-17082: Fix XSS via Transfer-Encoding: chunked in apache2 SAPI - CVE-2018-10545: Do not set PRSETDUMPABLE by default in php-fpm child...

php: Dumpable FPM child processes allow bypassing opcache access controls

An issue was discovered in PHP before 5.6.35, 7.0.x before 7.0.29, 7.1.x before 7.1.16, and 7.2.x before 7.2.4. Dumpable FPM child processes allow bypassing opcache access controls because fpmunix.c makes a PRSETDUMPABLE prctl call, allowing one user in a multiuser environment to obtain sensitive...