* automake.in (am_macro_for_var): Add LIBTOOL.

* automake.in (am_macro_for_var): Add LIBTOOL.
(ac_macro_for_var): Add RANLIB.
(seen_libtool): Remove.
(handle_libtool, lang_c_finish,	define_compiler_variable,
make_paragraphs): Use
variable_defined ('LIBTOOL') instead of $seen_libtool.
(handle_languages) <%transform>: Don't set 'LIBTOOL', it is
already done in make_paragraphs.
(handle_libraries): Simplify by requiring RANLIB with
&require_variables_for_macro.
(handle_ltlibraries): Simplify by requiring LIBTOOL with
&require_variables_for_macro.
(scan_autoconf_traces): Don't trace for AC_PROG_LIBTOOL and
AM_PROG_LIBTOOL.
* tests/libtool4.test, tests/library2.test: New files.
* tests/Makefile.in (TESTS): Add libtool4.test and library2.test.