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…sion, then use _eigen3_check_version
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followup on #395, Eigen5 differences go deeper than version extraction
Eigen version detection and C++ standard selection:
FindEigen3.cmaketo manually check the Eigen3 version and ignore the version reported byEigen3Configif it is unreliable, ensuring accurate detection of Eigen3.5+.export/CMakeLists.txt.exportto set theLIBINT2_CXX_STANDARDvariable to 11 by default, and automatically switch to 14 if Eigen 3.5 or newer is found, with a status message for clarity.