chinese/opencc: fix build with clang 19
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.
PR: 280796
Approved by: lichray@gmail.com (maintainer)
MFH: 2024Q3