$(builddir) should be $(top_builddir), and we need a valid definition of
MKDIR_P to create the docs.
Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Add autoconf & automake metadata, plus required files for automake to
run without complaint.
Requires an update to ccan, to get the --build-type argument to
create-ccan-tree.
Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>