fix linux build

Author: wootguy

src/nav/LeafNavMesh.cpp

@@ -11,6 +11,8 @@
 #include "Fgd.h"
 #include "globals.h"
 #include <queue>
+#include <algorithm>
+#include <limits.h>
 
 LeafNode::LeafNode() {
 	links.clear();

src/nav/LeafNavMeshGenerator.cpp

@@ -8,6 +8,7 @@
 #include "util.h"
 #include "LeafOctree.h"
 #include <algorithm>
+#include <float.h>
 
 LeafNavMesh* LeafNavMeshGenerator::generate(Bsp* map, int hull) {
 	float NavMeshGeneratorGenStart = glfwGetTime();