Remove obsolete gcc.dg/sso-9.c

gcc/testsuite/
	* gcc.dg/sso-9.c: Delete.

gcc/testsuite/gcc.dg/sso-9.c

@@ -1,27 +0,0 @@
-/* Test support of scalar_storage_order attribute */
-
-/* { dg-do compile } */
-
-#include <stdarg.h>
-
-int x;
-
-#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
-struct __attribute__((scalar_storage_order("big-endian"))) Rec
-{
-  va_list v;
-};
-#else
-struct __attribute__((scalar_storage_order("little-endian"))) Rec
-{
-  va_list v;
-};
-#endif
-
-void foo (int i, ...)
-{
-  struct Rec a;
-  va_start (a.v, i);
-  a.v = 0, x = va_arg (a.v, int); /* { dg-error "type|reverse storage order" } */
-  va_end (a.v);
-}