Use consistent e2fsprogs-standard types

Use consistent e2fsprogs-standard types

Some different types such as u_int16_t and __uint32_t have snuck into
e2fsprogs.  These types are not guaranteed by any standard, and they
are not provided by dietlibc.  Convert them to __u16, __u32,
etc. since these are guaranteed to be provided by e2fsprogs' build.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>