doc: fix distcheck.
doc: fix distcheck.

	* doc/tests/local.mk: Filter out the generated files that are in
	builddir, since in a non VPATH build in a tarball, these files
	will be found by ls_files, so the test suite will attempt to
	generate a test suite from it.  It must not.

urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi