automake and libtool fixes

automake and libtool fixes

Remove aclocal.m4 from the repository and generate it when needed.
Move the AC_PROG_LIBTOOL autoconf macro and use libtoolize according to
the libtool info pages.

Make sure that libtoolize adds the auxiliary files (config.guess and config.sub).

Move install-sh into include/ so that libtoolize does not destroy it.

Split up the ``make clean'' and ``make distclean'' targets: the former
removes all files generated during a build.  The latter removes all
files generated by libtoolize, autoconf, and configure as well.

Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>