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kdePackages.qmlbox2d: revendor Box2D
They require an older version than our main `box2d_2` package (which itself is only used for LibreOffice). Our package works fine with CMake 4, as does the CMake build system they use in their vendored version, but the upstream release of the old version does not. Since this is a somewhat pointless single‐package use of `overrideAttrs`, just let it handle the Box2D build itself.