JH/16 Fix bug in DKIM verify: a buffer overflow could corrupt the malloc
metadata, resulting in a crash in free().
-PP/01 Fix broken refactor of Heimdal GSSAPI authenticator init.
+PP/01 Fix broken Heimdal GSSAPI authenticator integration.
Broken in f2ed27cf5, missing an equals sign for specified-initialisers.
+ Broken also in d185889f4, with init system revamp.
Exim version 4.90