Bug#989550: SuiteSparse 64-bit

[Tim Davis]

I'm working on a major update to the SuiteSparse build system, which uses
cmake exclusively.  See the dev2 branch
on the SuiteSparse github.  I have a very slightly modified version of
metis, and I compile it
under the name libsuitesparse_metis.so.  It compiles metis with
IDXTYPEWIDTH of 64.

I no longer use SuiteSparse_long, but just int64_t in its place.  That
makes the build more predictable.

This change might resolve this bug.  The dev2 branch is still in progress
but it's getting close.
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