[Bug 269835] math/rankwidth： Fix buil d

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269835

            Bug ID: 269835
           Summary: math/rankwidth： Fix build
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: wen@FreeBSD.org

Created attachment 240423
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=240423&action=edit
Fix build

fix build with new igraph

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