acconfig.h:
  Default undef for example storage engine.
acinclude.m4:
  Build macro additions for example engine.
configure.in:
  Configure changes for it to be listed in --help
sql/Makefile.am:
  Added in paths to build example.
sql/examples/ha_example.cc:
  Correction in indention and a few minor other corrections. It now lets you create/open/drop example engine.
sql/handler.cc:
  Added definition for the example storage engine. Added case for it to be created.
sql/handler.h:
  Added example storage engine type.
sql/mysql_priv.h:
  Added flag for optional build of example storage engine.
sql/mysqld.cc:
  Pieces to build example storage engine.