php: Fix of 4 CVEs

CVE-2018-14883: fix integer overflow leading to heap buffer overflow in exifthumbnailextract - CVE-2019-19246: fix heap buffer overflow in oniguruma strlowercasematch - CVE-2018-19518: disable imap rsh/ssh by default to prevent argument injection imap.enableinsecurersh INI added - CVE-2018-20783:...