Merge a change from MySQL:

  ------------------------------------------------------------
  revno: 2988
  committer: Satya B <satya.bn@sun.com>
  branch nick: mysql-5.1-bugteam
  timestamp: Wed 2009-07-01 11:06:05 +0530
  message:
    Fix build failure after applying Innodb snapshot 5.1-ss5282
    
    After applying Innodb snapshot 5.1-ss5282, build was broken
    because of missing header file. 
    
    Adding the header file to Makefile.am after informing the 
    innodb developers.
  modified:
    storage/innobase/Makefile.am