Use texi2dvi --clean to work around a bug in texi2dvi

Use texi2dvi --clean to work around a bug in texi2dvi

If the sources for e2fsprogs are located in a pathname that contains a
tilde character (which can happen when the sources are unpacked using
"apt-get source" when e2fsprogs has a pre-release test version),
texi2dvi will fail due to a bug (Debian bug #822492: "texinfo:
texi2dvi doesn't protect the ~ character in the second pass").  Work
around this bug by using texi2dvi --clean.

Addresses-Debian-Bug: #822227

Reported-by: svante.signell@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>