Fixed include for qsort

core/Scanline.cpp

@@ -1,7 +1,7 @@
 
 #include "Scanline.h"
 
-#include <algorithm>
+#include <cstdlib>
 #include "arithmetics.hpp"
 
 namespace msdfgen {

core/Shape.cpp

@@ -1,7 +1,7 @@
 
 #include "Shape.h"
 
-#include <algorithm>
+#include <cstdlib>
 #include "arithmetics.hpp"
 
 namespace msdfgen {

core/edge-coloring.cpp

@@ -1,6 +1,7 @@
 
 #include "edge-coloring.h"
 
+#include <cstdlib>
 #include <cmath>
 #include <cstring>
 #include <cfloat>