MGASA-2017-0246 Updated php and libgd packages fix security vulnerabilities

Buffer over-read into uninitialized memory in libgd CVE-2017-7890. Security issues from bundled oniguruma in php-mbstring CVE-2017-9224, CVE-2017-9226, CVE-2017-9227, CVE-2017-9228, CVE-2017-9229...