[Bug 268278] graphics/py-pygraphviz: fix build with clang 15

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268278

--- Comment #2 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/ports/commit/?id=f2f3ab67ff127029f70393a05f2f8e560d70ccb4

commit f2f3ab67ff127029f70393a05f2f8e560d70ccb4
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2022-12-09 17:41:55 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2022-12-18 17:29:15 +0000

    graphics/py-pygraphviz: fix build with clang 15

    During an exp-run for llvm 15 (see bug 265425), it turned out that
    graphics/py-pygraphviz failed to build with clang 15:

      pygraphviz/graphviz_wrap.c:3047:12: error: incompatible pointer to
integer conversion returning 'Agsym_t *' (aka 'struct Agsym_s *') from a
function with result type 'int' [-Wint-conversion]
          return agattr(g, kind, name, val);
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~
      1 error generated.

    In graphviz.i and the swig-generated graphviz_wrap.c, the agattr_label()
    function is incorrectly labeled as returning 'int', while it should
    return 'Agsym_t *' instead. Upstream fixed this as part of a much bigger
    commit [1], and they also regenerated the swig wrapper.

    For our case, it is simpler to patch the wrapper instead, as otherwise
    you would have to add swig as a build-time dependency.

    [1]
https://github.com/pygraphviz/pygraphviz/commit/79fdee178785620b90241c70a0efab9dd57e3c86

    PR:             268278
    Approved by:    portmgr (tcberner)
    MFH:            2022Q4

 .../files/patch-pygraphviz_graphviz__wrap.c (new)  | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)

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