[Bug 280796] chinese/opencc: fix build with clang 19

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280796

            Bug ID: 280796
           Summary: chinese/opencc: fix build with clang 19
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: dim@FreeBSD.org
                CC: lichray@gmail.com
             Flags: maintainer-feedback?(lichray@gmail.com)
                CC: lichray@gmail.com

Clang 19 now diagnoses incorrect member accesses, which causes
chinese/opencc to fail with an error similar to:

   
/wrkdirs/usr/ports/chinese/opencc/work/OpenCC-ver.1.1.6/src/../deps/rapidjson-1.1.0/rapidjson/document.h:319:82:
error: cannot assign to non-static data member 'length' with const-qualified
type 'const SizeType' (aka 'const unsigned int')
      319 |     GenericStringRef& operator=(const GenericStringRef& rhs) { s =
rhs.s; length = rhs.length; }
          |                                                                    
      ~~~~~~ ^
   
/wrkdirs/usr/ports/chinese/opencc/work/OpenCC-ver.1.1.6/src/../deps/rapidjson-1.1.0/rapidjson/document.h:325:20:
note: non-static data member 'length' declared const here
      325 |     const SizeType length; //!< length of the string (excluding the
trailing NULL terminator)
          |     ~~~~~~~~~~~~~~~^~~~~~

Upstream rapidjson fixed this by removing the operator= function in
https://github.com/Tencent/rapidjson/commit/3b2441b8, so pull this in as
a patch and apply it.

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