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Newer LLVM/libc++ versions (e.g. LLVM 23.1.3, llvm-mingw-20261006-ucrt) no longer transitively include <iterator> and <atomic>. This causes build failures in: modules/calib3d/src/stereo_geom.cpp, modules/gapi/include/opencv2/gapi/infer/ie.hpp (std::back_inserter), and modules/gapi/include/opencv2/gapi/gasync_context.hpp (std::atomic). Fixes build with modern LLVM/MinGW toolchains without CMake workarounds.