Log Message:
Update cyrus-sasl to 2.1.26.

New in 2.1.26
-------------

* Modernize SASL malloc/realloc callback prototypes
* Added sasl_config_done() to plug a memory leak when using an application
  specific config file
* Fixed PLAIN/LOGIN authentication failure when using saslauthd
  with no auxprop plugins (bug # 3590).
* unlock the mutex in sasl_dispose if the context was freed by another thread
* MINGW32 compatibility patches
* Fixed broken logic in get_fqhostname() when abort_if_no_fqdn is 0
* Fixed some memory leaks in libsasl
* GSSAPI plugin:
 - Fixed a segfault in gssapi.c introduced in 2.1.25.
 - Code refactoring
 - Added support for GSS-SPNEGO SASL mechanism (Unix only), which is also
   HTTP capable
* GS2 plugin:
 - Updated GS2 plugin not to lose minor GSS-API status codes on errors
* DIGEST-MD5 plugin:
 - Correctly send "stale" directive to prevent clients from (re)promtping
   for password
 - Better handling of HTTP reauthentication cases
 - fixed some memory leaks
* SASLDB plugin:
 - Added support for BerkleyDB 5.X or later
* OTP plugin:
 - Removed calling of EVP_cleanup() on plugin shutdown in order to prevent
   TLS from failing in calling applications
* SRP plugin:
 - Removed calling of EVP_cleanup() on plugin shutdown in order to prevent
   TLS from failing in calling applications
* saslauthd:
 - auth_rimap.c: qstring incorrectly appending the closing double quote,
   which might be causing crashes
 - auth_rimap.c: read the whole IMAP greeting
 - better error reporting from some drivers
 - fixed some memory leaks