eliminate use of USE_64_BIT_IDX_T * common.mk (do_subst_config_vals, do_subst_cross_config_vals): Don't substitute OCTAVE_CONF_USE_64_BIT_IDX_T. * toplev.cc (octave_config_info): Set USE_64_BIT_IDX_T from OCTAVE_CONF_ENABLE_64. * oct-conf.in.h (OCTAVE_CONF_USE_64_BIT_IDX_T): Delete macro. * oct-hdf5.h, amd.cc, ccolamd.cc, colamd.cc, dmperm.cc, symbfact.cc, ov.cc, CSparse.cc, CSparse.h, MArray-i.cc, dSparse.cc, dSparse.h, SparseCmplxQR.h, SparseQR.h, sparse-base-chol.cc, lo-array-errwarn.cc, lo-array-gripes.cc, oct-sparse.h, acinclude.m4, oct-conf-post.in.h, computer.m: Use ENABLE_64 instead of USE_64_BIT_IDX_T.

--- a/scripts/miscellaneous/computer.m	Sun Jan 24 13:50:04 2016 -0500
+++ b/scripts/miscellaneous/computer.m	Mon Jan 25 19:16:31 2016 -0500
@@ -71,7 +71,7 @@
     else
       c = msg;
       if (isargout (2))
-        if (strcmp (octave_config_info ("USE_64_BIT_IDX_T"), "true"))
+        if (strcmp (octave_config_info ("ENABLE_64"), "true"))
           maxsize = 2^63-1;
         else
           maxsize = 2^31-1;