Fixed array overrun when using drop_db
Portability fixes


BitKeeper/etc/ignore:
  Added libmysqld/examples/completion_hash.cc libmysqld/examples/completion_hash.h libmysqld/examples/my_readline.h libmysqld/examples/mysql.cc libmysqld/examples/mysqltest.c libmysqld/examples/readline.cc libmysqld/examples/sql_string.cc libmysqld/examples/sql_string.h to the ignore list
acinclude.m4:
  Fixed reference to top_builddir
myisam/mi_write.c:
  Fixed locking problem when using bulk insert
sql/sql_db.cc:
  Fixed array overrun when using drop_db