[Bug 219932] cad/tochnog: drop support for superlu_mt

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219932

            Bug ID: 219932
           Summary: cad/tochnog: drop support for superlu_mt
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: pfg at FreeBSD.org

Created attachment 183414
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183414&action=edit
remove superlu_mt option from cad/tochnog

tochnog hasn't maintained the superlu_mt interface (or much else) in a long
time.

tochnog currently has an optional dependency on superlu_mt 2.0. Unfortunately
even SuperLU MT 2.4 has changed the interface and the new interface is not
trivial to update. Furthermore some tochnog files are in a weird format without
control returns for which I can't generate clean diffs.

I tried to build SuperLU MT 2.1, 2.2, and 2.3: all had problems or wanted to
build with OpenMP and ultimately I think it is just not worth it.

Let's just drop the option as it won't work when we bring in the modern
superlu_mt 3.1 version.

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