This patch converts the indirect block definitions from blkt_t type to 
__u32.

Changes from the previous version:
- Fix errors found in the test suite "make check"

  e2fsck/pass1.c         |    2 -
  e2fsck/super.c         |    4 +-
  lib/ext2fs/bb_inode.c  |   10 +++---
  lib/ext2fs/block.c     |   71 
++++++++++++++++++++++++++++++-------------------
  lib/ext2fs/bmap.c      |   10 +++---
  lib/ext2fs/ext2fs.h    |    4 +-
  lib/ext2fs/ind_block.c |    4 +-
  lib/ext2fs/inode.c     |    4 +-
  misc/e2image.c         |    2 -
  9 files changed, 64 insertions(+), 47 deletions(-)