Compatibility between PIQP and laOPT

When building/installing PIQP (before laOPT), pay attention to the Eigen alignment settings (see “Warning” in the PIQP docs). To ensure compatibility and make PIQP export the Eigen alignment settings with which it has been compiled, set -DBUILD_WITH_EIGEN_MAX_ALIGN_BYTES=ON when building PIQP, e.g.:

cmake .. -DCMAKE_CXX_FLAGS="-march=native" -DBUILD_BENCHMARKS=OFF -DBUILD_WITH_EIGEN_MAX_ALIGN_BYTES=ON