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The lack of 32-bit support was causing febootstrap to crash since it
wasn't passing EXT2_FLAG_64BITS when opening the file system, so we
were still using the legacy bitmaps.

Also add support for bigalloc bitmap into the ffz functions.

Addresses-Red-Hat-Bugzilla: #808421
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>