generate convenience libraries for new parse-tree and interpfcn subdirectories * src/Makefile.am (liboctinterp_la_SOURCES): Include octave.cc in the list, not $(DIST_SRC). (liboctinterp_la_LIBADD): Include octave-value/liboctave-value.la, parse-tree/libparse-tree.la, interp-core/libinterp-core.la, interpfcn/libinterpfcn.la, and corefcn/libcorefcn.la in the list. * src/interp-core/module.mk (noinst_LTLIBRARIES): Add interp-core/libinterp-core.la to the list. (interp_core_libinterp_core_la_SOURCES): New variable. * src/interpfcn/module.mk (noinst_LTLIBRARIES): Add interpfcn/libinterpfcn.la to the list. (interpfcn_libinterpfcn_la_SOURCES): New variable. * src/parse-tree/module.mk (noinst_LTLIBRARIES): Add parse-tree/libparse-tree.la to the list. (parse_tree_libparse_tree_la_SOURCES): New variable. * src/octave-value/module.mk (noinst_LTLIBRARIES): Add octave-value/liboctave-value.la to the list. (octave_value_liboctave_value_la_SOURCES): New variable.