Log Message:
Update to 0.99.13. From the changelog:

* GNUTLS support hasn't been working for a while, so it's not even
  tried to be used anymore unless explicitly wanted.
+ Added CRAM-MD5 authentication mechanism. Patch by Joshua Goodall
+ Added SMD5 and LDAP-MD5 password schemes and changed MD5 scheme to
  use LDAP-MD5 if the password isn't in MD5crypt format. Patch by
  Joshua Goodall
+ Workaround for some POP3 client bugs: if message doesn't contain the
  "end of headers" empty line, add it automatically.
+ vpopmail supports now all password schemes, most importantly
  MD5crypt works now without support from libc's crypt()
- SQL and LDAP authentication was broken
- SEARCH UNKEYWORD wasn't working

pkgsrc changes:

* Disable GNU TLS support for the time being.
* Move the workaround for the gcc2 sparc64 ICE into hacks.mk.
* Format DESCR.