Split Linux platform target and move runtime/platform state

src/app_events.cpp

@@ -15,6 +15,7 @@
 #ifdef _WIN32
 #include "platform_windows/windows_platform_services.h"
 #endif
+#include "platform_legacy/legacy_platform_state.h"
 #include "platform_legacy/legacy_platform_services.h"
 #include "renderer_gl/opengl_capabilities.h"
 
@@ -65,10 +66,11 @@ void App::set_platform_services(pp::platform::PlatformServices* services) noexce
     if (services)
     {
         pp::platform::linux_desktop::set_fps_title_callback([this](std::string title) {
-            if (!glfw_window)
+            auto* const window = pp::platform::legacy::active_legacy_glfw_window_state().window;
+            if (!window)
                 return;
 
-            glfwSetWindowTitle(glfw_window, title.c_str());
+            glfwSetWindowTitle(window, title.c_str());
         });
     }
     else