[scs] Disable negative test in shadowcallstack.
The test checks that scs does NOT work correctly w/o runtime support.
That's a strange thing to test, and it is also flaky, because things
may just work if x18 happens to point to a writable page.
-// RUN: %clang_scs -D INCLUDE_RUNTIME %s -o %t
-// RUN: %run %t
-
// RUN: %clang_scs %s -o %t
-// RUN: not --crash %run %t
+// RUN: %run %t
// Basic smoke test for the runtime
#include "libc_support.h"
-
-#ifdef INCLUDE_RUNTIME
#include "minimal_runtime.h"
-#else
-#define scs_main main
-#endif
int scs_main(void) {
scs_fputs_stdout("In main.\n");
