The utility 'mysqlbinlog' now accepts input from stdin. It can 
  now be used to read the output from, e.g., 'zcat' or other utility.


client/mysqlbinlog.cc:
  Reading from stdin instead of stdout [sic].
  Not repositioning manually since my_b_read does that correctly.
mysql-test/r/mysqlbinlog.result:
  Adding tests for reading from stdin.
mysql-test/t/mysqlbinlog.test:
  Adding tests for reading from stdin.