[Bug 281358] graphics/vigra: fix build with clang 19

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281358

--- Comment #3 from commit-hook@FreeBSD.org ---
A commit in branch 2024Q3 references this bug:

URL:
https://cgit.FreeBSD.org/ports/commit/?id=ce0335c20a5dc0527b0ea764e1dcd8891b1026ea

commit ce0335c20a5dc0527b0ea764e1dcd8891b1026ea
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2024-09-08 08:57:41 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2024-09-28 09:48:23 +0000

    graphics/vigra: fix build with clang 19

    Clang 19 is more strict about manipulating `this` in C++, which results
    in an error compiling graphics/vigra:

       
/wrkdirs/usr/ports/graphics/vigra/work/vigra-8acd73a/include/vigra/multi_iterator_coupled.hxx:493:9:
error: expression is not assignable
          493 |         --this;
              |         ^ ~~~~

    Here, the intent is to call the prefix operator-- on the object, which
    should be spelled either "--*this" or "operator--()".

    PR:             281358
    Approved by:    maintainer timeout (2 weeks)
    MFH:            2024Q3

    (cherry picked from commit 5a269b5cd4965710fa4e02fdb1cc2ffe6def6921)

 .../patch-include_vigra_multi__iterator__coupled.hxx (new)    | 11 +++++++++++
 1 file changed, 11 insertions(+)

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