configury: use explicit lists instead of $(wildcard ...).

* local.mk (dist_classes_DATA, dist_modules_DATA): Only GNU make
supports $(wildcard ...) expressions, and Automake complains
every time it sees one. List files explicitly.
($(dist_doc_DATA)): Add $(dist_classes_DATA) and
$(dist_modules_DATA) to LHS of this rule so that make knows it
has to run LDoc to create those files.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>