eliminate recursive build in liboctave/cruft directory * liboctave/cruft/module.mk: New file, adapted from Makefile.am. * liboctave/cruft/Makefile.am: Delete. * configure.ac (AC_OUTPUT): Don't generate liboctave/cruft/Makefile. * liboctave/array/module.mk, liboctave/numeric/module.mk, liboctave/operators/module.mk, liboctave/system/module.mk, liboctave/util/module.mk: Append convenience library name to liboctave_la_LIBADD here. * liboctave/Makefile.am: Initialize liboctave_la_LIBADD to empty string here. * liboctave/cruft/Faddeeva/module.mk, liboctave/cruft/amos/module.mk, liboctave/cruft/blas-xtra/module.mk, liboctave/cruft/daspk/module.mk, liboctave/cruft/dasrt/module.mk, liboctave/cruft/dassl/module.mk, liboctave/cruft/fftpack/module.mk, liboctave/cruft/lapack-xtra/module.mk, liboctave/cruft/misc/module.mk, liboctave/cruft/odepack/module.mk, liboctave/cruft/ordered-qz/module.mk, liboctave/cruft/quadpack/module.mk, liboctave/cruft/ranlib/module.mk, liboctave/cruft/slatec-err/module.mk, liboctave/cruft/slatec-fn/module.mk: Adapt for non-recursive build.