launchers: Remove --tty option

This doesn't work with any of the launchers we've kept. Remove the option
and all the bits that handle it.

Signed-off-by: Derek Foreman <derek.foreman@collabora.com>

include/libweston/backend-drm.h

@@ -35,7 +35,7 @@
 extern "C" {
 #endif
 
-#define WESTON_DRM_BACKEND_CONFIG_VERSION 4
+#define WESTON_DRM_BACKEND_CONFIG_VERSION 5
 
 struct libinput_device;
 
@@ -171,9 +171,6 @@ weston_drm_virtual_output_get_api(struct weston_compositor *compositor)
 struct weston_drm_backend_config {
 	struct weston_backend_config base;
 
-	/** The tty to be used. Set to 0 to use the current tty. */
-	int tty;
-
 	/** Whether to use the pixman renderer instead of the OpenGL ES renderer. */
 	bool use_pixman;
 

include/libweston/backend-fbdev.h

@@ -34,14 +34,13 @@ extern "C" {
 
 #include <libweston/libweston.h>
 
-#define WESTON_FBDEV_BACKEND_CONFIG_VERSION 2
+#define WESTON_FBDEV_BACKEND_CONFIG_VERSION 3
 
 struct libinput_device;
 
 struct weston_fbdev_backend_config {
 	struct weston_backend_config base;
 
-	int tty;
 	char *device;
 
 	/** Callback used to configure input devices.