Pick overload for NavigationMesh::Build

Script/Packages/Atomic/Navigation.json

@@ -3,5 +3,10 @@
 	"requires" : ["3D"],
 	"sources" : ["Source/Atomic/Navigation"],
 	"includes" : ["<Atomic/Scene/Node.h>"],
-	"classes" : ["Navigable", "NavigationMesh", "OffMeshConnection"]
+	"classes" : ["Navigable", "NavigationMesh", "OffMeshConnection"],
+	"overloads" : {
+		"NavigationMesh" : {
+			"Build" : []
+		}
+	}
 }