Trying to fix compilation of IGL AABB tree on 32 bit platform.

Removing alignment constraints from Eigen Matrix aliases.

src/libslic3r/SLA/SLABoilerPlate.hpp

@@ -64,7 +64,7 @@ struct Contour3D {
     }
 };
 
-using PointSet = Eigen::MatrixXd;
+//using PointSet = Eigen::Matrix<double, Eigen::Dynamic, Eigen::Dynamic, Eigen::DontAlign>; //Eigen::MatrixXd;
 using ClusterEl = std::vector<unsigned>;
 using ClusteredPoints = std::vector<ClusterEl>;