add linux support

src/app.h

@@ -31,6 +31,11 @@
 #ifdef __ANDROID__
 #include "main.h"
 #endif
+
+#ifdef __LINUX__
+#include <GLFW/glfw3.h>
+#endif
+
 #include "node_panel_grid.h"
 #include "node_panel_quick.h"
 #include "node_input_box.h"
@@ -147,11 +152,11 @@ public:
     
 #if defined(__IOS__) && defined(__OBJC__)
     GameViewController* ios_view;
-#endif
-
-#if defined(__OSX__) && defined(__OBJC__)
+#elif defined(__OSX__) && defined(__OBJC__)
     View* osx_view;
     AppOSX* osx_app;
+#elif __LINUX__
+    GLFWwindow* glfw_window;
 #endif
 
 #ifdef __ANDROID__