[Bug 284159] math/linbox: fix build with clang 19

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284159

            Bug ID: 284159
           Summary: math/linbox: fix build with clang 19
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: thierry@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(thierry@FreeBSD.org)
          Assignee: thierry@FreeBSD.org

Clang 19 has become more strict about errors in member functions, which
results in errors building math/linbox:

  ../../linbox/vector/blas-subvector.h:121:20: error: no member named 'data' in
'BlasSubvector<_Vector>'
    121 |             _ptr(V.data()+beg), _size(dim), _inc(inc),
_field(&V.field()) {}
        |                  ~ ^
  ../../linbox/matrix/sparsematrix/sparse-ell-matrix.h:1216:16: error: cannot
assign to non-static data member '_ld' with const-qualified type 'const size_t
&' (aka 'const unsigned long &')
   1216 |                                 _ld        = iter._ld ;
        |                                 ~~~        ^
  ../../linbox/matrix/sparsematrix/sparse-ellr-matrix.h:1108:12: error: no
viable overloaded '='
   1108 |                                 _rowid = iter._rowid;
        |                                 ~~~~~~ ^ ~~~~~~~~~~~

In all these cases, the methods where the errors occur are not actually
used, so until upstream sorts out their incorrect code, stub them out
using #if 0/#endif pairs.

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