Added missing includes (GCC 11.2 without PCH).

src/libslic3r/AABBMesh.hpp

@@ -5,6 +5,7 @@
 #include <vector>
 
 #include <libslic3r/Point.hpp>
+#include <libslic3r/TriangleMesh.hpp>
 
 // There is an implementation of a hole-aware raycaster that was eventually
 // not used in production version. It is now hidden under following define

src/libslic3r/MeshNormals.cpp

@@ -1,5 +1,8 @@
 #include "MeshNormals.hpp"
 
+#include <numeric>
+#include <boost/container/small_vector.hpp>
+
 namespace Slic3r {
 
 static bool point_on_edge(const Vec3d& p, const Vec3d& e1, const Vec3d& e2,