Add glfw.GetCocoaWindow

vendor/glfw/native_linux.odin

@@ -0,0 +1,15 @@
+//+build linux
+
+package glfw
+
+// TODO: Native Linux
+// Display* glfwGetX11Display(void);
+// RRCrtc glfwGetX11Adapter(GLFWmonitor* monitor);
+// RROutput glfwGetX11Monitor(GLFWmonitor* monitor);
+// Window glfwGetX11Window(GLFWwindow* window);
+// void glfwSetX11SelectionString(const char* string);
+// const char* glfwGetX11SelectionString(void);
+
+// struct wl_display* glfwGetWaylandDisplay(void);
+// struct wl_output* glfwGetWaylandMonitor(GLFWmonitor* monitor);
+// struct wl_surface* glfwGetWaylandWindow(GLFWwindow* window);