* doc/libtool.texi (LT_INIT): Fix wording of intro a bit.

* doc/libtool.texi (LT_INIT): Fix wording of intro a bit.
<shared, static>: Also describe these default LT_INIT options.
<AC_LIBTOOL_DLOPEN, AC_LIBTOOL_WIN32_DLL>
<AC_DISABLE_FAST_INSTALL>: Mention deprecated macro names,
including the respective LT_INIT replacement.
<AC_DISABLE_SHARED, AC_DISABLE_STATIC, AC_ENABLE_SHARED>
<AC_ENABLE_STATIC>: Document, un-deprecate.  Suggest the
respective LT_INIT replacement.
<AM_DISABLE_SHARED, AM_DISABLE_STATIC, AM_ENABLE_SHARED>
<AM_ENABLE_STATIC>: Document deprecated aliases.
(Distributing libltdl) <AC_WITH_LTDL, AC_LIBLTDL_INSTALLABLE>
<AC_LIBLTDL_CONVENIENCE>: Document deprecated aliases.
* libltdl/m4/ltoptions.m4 (AM_ENABLE_SHARED, AM_DISABLE_SHARED)
(AM_ENABLE_STATIC, AM_DISABLE_STATIC): Make these AU_ALIASes of
the respective AC_* macros, so we do not recommend LT_INIT(*) in
this case.
(AC_ENABLE_SHARED, AC_DISABLE_SHARED, AC_ENABLE_STATIC)
(AC_DISABLE_STATIC): Un-deprecate these.  Remove now-superfluous
aclocal-1.4 backwards compatibility comments.