Forcefully disable stack scanning, unportable and completely broken when
built by clang 15.

Index: scsilib/include/mconfig.h
--- scsilib/include/mconfig.h.orig
+++ scsilib/include/mconfig.h
@@ -137,6 +137,8 @@ extern "C" {
 #endif
 #endif
 
+#undef	HAVE_SCANSTACK
+
 /*
  * Allow to overwrite the defines in the makefiles by calling
  *