JH/20 DANE support moved from Experimental to mainline. The Makefile control
for the build is renamed.
+JH/21 Fix memory leak during multi-message connections using STARTTLS. A buffer
+ was allocated for every new TLS startup, meaning one per message. Fix
+ by only allocating once (OpenSSL) or freeing on TLS-close (GnuTLS).
+
Exim version 4.90
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