compositor: Drop output->flags
All outputs are EGLSurface based so we can drop this detail now.
diff --git a/src/compositor-wayland.c b/src/compositor-wayland.c
index ed28b1d..4810731 100644
--- a/src/compositor-wayland.c
+++ b/src/compositor-wayland.c
@@ -391,8 +391,7 @@
wl_list_insert(&output->base.mode_list, &output->mode.link);
output->base.current = &output->mode;
- weston_output_init(&output->base, &c->base, 0, 0, width, height,
- WL_OUTPUT_FLIPPED);
+ weston_output_init(&output->base, &c->base, 0, 0, width, height);
output->base.border.top = c->border.top;
output->base.border.bottom = c->border.bottom;