patch 9.1.1492: tests: failure when Wayland compositor fails to start

Problem:  tests: failure when Wayland compositor fails to start
Solution: instead of throwing an error causing a failure, throw
          "Skipped", so that the Vim test suite continues and does not
          fail

Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/window_manager.vim

@@ -42,7 +42,7 @@ endfunc
 
 func s:StartCompositorExit(job, status)
     if s:wayland_display_name == ""
-      throw "Error: Wayland compositor exited when starting up"
+      throw "Skipped: Error: Wayland compositor exited when starting up"
     endif
 endfunc
 

src/version.c

@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1492,
 /**/
     1491,
 /**/