Fix compiling issues without debug mode in my log code

src/graphics/camera.hpp

@@ -25,6 +25,7 @@
 #include "utils/no_copy.hpp"
 #include "utils/aligned_array.hpp"
 #include "utils/leak_check.hpp"
+#include "utils/log.hpp"
 #include "utils/vec3.hpp"
 
 #include "SColor.h"

src/graphics/particle_kind.cpp

@@ -23,6 +23,7 @@
 #include "io/file_manager.hpp"
 #include "io/xml_node.hpp"
 #include "utils/constants.hpp"
+#include "utils/log.hpp"
 
 #include <stdexcept>
 

src/guiengine/abstract_top_level_container.hpp

@@ -21,6 +21,7 @@
 
 
 #include "guiengine/widget.hpp"
+#include "utils/log.hpp"
 #include "utils/ptr_vector.hpp"
 
 #include <cstring> // for NULL

src/tracks/graph_node.cpp

@@ -22,6 +22,7 @@
 #include "io/xml_node.hpp"
 #include "tracks/quad_graph.hpp"
 #include "tracks/quad_set.hpp"
+#include "utils/log.hpp"
 
 // ----------------------------------------------------------------------------
 /** Constructor. Saves the quad index which belongs to this graph node.