[Bug 271055] graphics/libGLU: fix build with clang 16

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271055

            Bug ID: 271055
           Summary: graphics/libGLU: fix build with clang 16
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(x11@FreeBSD.org)
          Assignee: x11@FreeBSD.org

Since clang 16 (and gcc 11) the default C++ standard is now gnu++17.
Because graphics/libGLU's Makefile does not explicitly set its C++ standard,
this leads to several errors:

  ../src/libnurbs/internals/varray.cc:76:5: error: ISO C++17 does not allow
'register' storage class specifier [-Wregister]
      register long ds = sgn(arc->tail()[0] - arc->prev->tail()[0]);
      ^~~~~~~~~
  ../src/libnurbs/internals/varray.cc:77:5: error: ISO C++17 does not allow
'register' storage class specifier [-Wregister]
      register long dt = sgn(arc->tail()[1] - arc->prev->tail()[1]);
      ^~~~~~~~~

Upstream already noticed this, and committed
https://gitlab.freedesktop.org/mesa/glu/-/commit/b6c308172993 as a fix,
so add this as an additional patch, until the next version is released.

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