Exim 4.92.3 security release

Exim 4.92.3 has been released with a fix for CVE-2019-16928, a heap-basedbuffer overflow in string_vformat that could lead to remote codeexecution. "The currently known exploit uses a extraordinary longEHLO string to crash the Exim process that is receiving the message. Whileat this mode of operation Exim already dropped its privileges, other paths toreach the vulnerable code may exist."