Added missing includes to fix build on gcc 9

src/libslic3r/Fill/FillBase.cpp

@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <numeric>
 
 #include "../ClipperUtils.hpp"
 #include "../EdgeGrid.hpp"

src/libslic3r/Point.cpp

@@ -2,6 +2,7 @@
 #include "Line.hpp"
 #include "MultiPoint.hpp"
 #include "Int128.hpp"
+#include "BoundingBox.hpp"
 #include <algorithm>
 
 namespace Slic3r {