Add keys for SDL 2.0.14's new gamepad buttons

This fixes the additional buttons triggering binds for ioq3 left
and right joystick direction keys.

code/client/cl_keys.c

@@ -316,6 +316,13 @@ keyname_t keynames[] =
 	{"PAD0_LEFTTRIGGER", K_PAD0_LEFTTRIGGER },
 	{"PAD0_RIGHTTRIGGER", K_PAD0_RIGHTTRIGGER },
 
+	{"PAD0_MISC1", K_PAD0_MISC1 },
+	{"PAD0_PADDLE1", K_PAD0_PADDLE1 },
+	{"PAD0_PADDLE2", K_PAD0_PADDLE2 },
+	{"PAD0_PADDLE3", K_PAD0_PADDLE3 },
+	{"PAD0_PADDLE4", K_PAD0_PADDLE4 },
+	{"PAD0_TOUCHPAD", K_PAD0_TOUCHPAD },
+
 	{NULL,0}
 };