Fixed bug in allocation memory in key cache. (Memory was not properly aligned which cased core dumps on sparc CPU's)
Changed keycache variables to start with my_ instead of _my_


include/my_sys.h:
  Changed keycache variables to start with my_ instead of _my_
myisam/mi_test2.c:
  Changed keycache variables to start with my_ instead of _my_
  Removed compiler warnings
myisam/sp_test.c:
  Removed compiler warning
mysys/mf_keycache.c:
  Fixed bug in allocation memory (Memory was not properly aligned which cased core dumps on sparc CPU's)
  Changed keycache variables to start with my_ instead of _my_
  Fixed indentation and comment syntax.
  Removed end space.
sql/mysqld.cc:
  Changed keycache variables to start with my_ instead of _my_
sql/sql_test.cc:
  Changed keycache variables to start with my_ instead of _my_