[CMake] add extension to fix CMP0115
fix: CMake Warning (dev) at unittest/CMakeLists.txt:10 (ADD_LIBRARY): Policy CMP0115 is not set: Source file extensions must be explicit. Run "cmake --help-policy CMP0115" for policy details. Use the cmake_policy command to set the policy and suppress this warning. File: …/eigenpy/unittest/eigen_ref.cpp Call Stack (most recent call first): unittest/CMakeLists.txt:33 (ADD_LIB_UNIT_TEST) This warning is for project developers. Use -Wno-dev to suppress it.
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