Add patch defining WL_SUBCOMPOSITOR_ERROR_BAD_PARENT for wayland < 1.22;

applied only on EL9 (which ships wayland 1.21).

12to11-1.0.0-wayland-1.21-compat.patch

@@ -0,0 +1,17 @@
+diff --git a/src/subsurface.c b/src/subsurface.c
+--- a/src/subsurface.c
++++ b/src/subsurface.c
+@@ -23,6 +23,13 @@
+ 
+ #include "compositor.h"
+ 
++#include <wayland-version.h>
++
++/* wayland < 1.22 lacks wl_subcompositor's bad_parent error.  */
++#if WAYLAND_VERSION_MAJOR == 1 && WAYLAND_VERSION_MINOR < 22
++#define WL_SUBCOMPOSITOR_ERROR_BAD_PARENT 1
++#endif
++
+ enum
+   {
+     PendingPosition	 = 1,