* acinclude.m4: Require AC_CANONICAL_TARGET, not AC_CANONICAL_SYSTEM.
Include ../config/acx.m4 and use ACX_NONCANONICAL_* where appropriate;
replace uses of *_alias with *_noncanonical.
* aclocal.m4: Rebuild with aclocal 1.4p6.
* Makefile.in: Rebuild with automake 1.4p6.
* doc/Makefile.in: Rebuild with automake 1.4p6.
* configure.in: Autoupdate with autoupdate 2.59.
* config.in: Regenerate with autoheader 2.59.
* configure: Regnerate with autoconf 2.59.
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