my_umask and my_umask_dir initialization has been moved to the my_init() func.


mysys/my_init.c:
  A fix (bug #6551: UMASK_DIR & UMASK not taken into account (mysqld.cc my_init.c inconsistency))
sql/mysqld.cc:
  A fix (bug #6551: UMASK_DIR & UMASK not taken into account (mysqld.cc my_init.c inconsistency))