Replace TEST_SET_BUT_UNUSED_VARIABLE by already defined EIGEN_UNUSED_VARIABLE
Replace TEST_SET_BUT_UNUSED_VARIABLE by already defined EIGEN_UNUSED_VARIABLE

ritsu1228/eigen,ROCmSoftwarePlatform/hipeigen,Zefz/eigen,TSC21/Eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,ritsu1228/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,pasuka/eigen,toastedcrumpets/eigen,Zefz/eigen,toastedcrumpets/eigen,ritsu1228/eigen,toastedcrumpets/eigen,ritsu1228/eigen,TSC21/Eigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,Zefz/eigen,pasuka/eigen,TSC21/Eigen,Zefz/eigen,TSC21/Eigen,toastedcrumpets/eigen,pasuka/eigen