Prepare for next stable release.

Prepare for next stable release.
* libltdl/Makefile.inc (LTDL_VERSION_INFO): Update.
* libltdl/m4/libtool.m4: Bump serial number to account for
changes since 2.2.4 release.
* INSTALL, config/config.guess, config/texinfo.tex: Updated
from canonical source.
* configure.ac (AM_INIT_AUTOMAKE): Specify dist-lzma, which
was introduced after automake-1.10 was released.
(abs_top_srcdir, abs_top_builddir): No need to substitute these
from configure anymore, since we require automake 1.10.1, which
does perform the substitutions properly.
(TIMESTAMP): Normal releases were displaying the long-form
timestamp.  Fix to show the short release timestamp as per
alpha release numbers.
* NEWS: Update with missing entries from ChangeLog.
* HACKING (Release Procedure): We release lzma tarballs now
but no xdeltas.
* Makefile.maint: Updated to match Release Procedure
instructions in HACKING.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>