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

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

--- Comment #3 from [email protected] ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/ports/commit/?id=88f549c0d62c1a897a69aeebbb15d8ec91c9dc20

commit 88f549c0d62c1a897a69aeebbb15d8ec91c9dc20
Author:     Dimitry Andric <[email protected]>
AuthorDate: 2023-04-24 20:31:37 +0000
Commit:     Dimitry Andric <[email protected]>
CommitDate: 2023-04-25 16:27:56 +0000

    graphics/libGLU: fix build with clang 16

    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.

    PR:             271055
    Approved by:    manu (maintainer)
    MFH:            2023Q2

 graphics/libGLU/Makefile | 5 ++++-
 graphics/libGLU/distinfo | 4 +++-
 2 files changed, 7 insertions(+), 2 deletions(-)

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