* tests/defs (ACLOCAL): Point to the installed aclocaldir is

* tests/defs (ACLOCAL): Point to the installed aclocaldir is
libtool is required.
* tests/lex.test: Run AC_INIT once.
* tests/ldflags.test, tests/listval.test, tests/suffix2.test:
Libtool is required.
* tests/header.test: Built a correct configure.in.
* tests/defun2.test (configure.in): Be a bit respectful with
Autoconf, close the macro invocations.
* tests/confdeps.test: Even when not using aclocal, aclocal.m4
must be correct.
* automake.in (scan_autoconf_traces): Add support for
AC_CANONICAL_HOST, AC_CANONICAL_SYSTEM, A[CM]_PROG_LIBTOOL,
AM_CONFIG_HEADER, AM_MAINTAINER_MODE.
* tests/condincl.test (target): Better pattern, to avoid matching
the definition of `target_alias' which is now properly discovered
as an AC_SUBST by traces.
* cond4.test: Better grep pattern: After all, why shouldn't
TWO_FALSE be AC_SUBST properly.
* tests/installsh.test (AUTOMAKE, ACLOCAL): Adjust.