Linux: Fix slow startup on some systems caused by GLFW searching for joysticks. Since kitty does not use joysticks, disable joystick support.

Fixes #830

kitty/glfw-wrapper.h

@@ -819,6 +819,7 @@ typedef int (* GLFWapplicationshouldhandlereopenfun)(int);
  *  @{ */
 #define GLFW_JOYSTICK_HAT_BUTTONS   0x00050001
 #define GLFW_DEBUG_KEYBOARD         0x00050002
+#define GLFW_ENABLE_JOYSTICKS       0x00050003
 
 #define GLFW_COCOA_CHDIR_RESOURCES  0x00051001
 #define GLFW_COCOA_MENUBAR          0x00051002

kitty/glfw.c

@@ -593,6 +593,9 @@ glfw_init(PyObject UNUSED *self, PyObject *args) {
     if (err) { PyErr_SetString(PyExc_RuntimeError, err); return NULL; }
     glfwSetErrorCallback(error_callback);
     glfwInitHint(GLFW_DEBUG_KEYBOARD, debug_keyboard);
+    // Joysticks cause slow startup on some linux systems, see
+    // https://github.com/kovidgoyal/kitty/issues/830
+    glfwInitHint(GLFW_ENABLE_JOYSTICKS, 0);
     global_state.opts.debug_keyboard = debug_keyboard != 0;
 #ifdef __APPLE__
     glfwInitHint(GLFW_COCOA_CHDIR_RESOURCES, 0);