get rid of SYSVIPC_COMPAT on ia64

it's always false, since it depends on COMPAT and
ia64 is not biarch.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/ia64/Kconfig.debug

@@ -56,9 +56,4 @@ config IA64_DEBUG_IRQ
 	  and restore instructions.  It's useful for tracking down spinlock
 	  problems, but slow!  If you're unsure, select N.
 
-config SYSVIPC_COMPAT
-	bool
-	depends on COMPAT && SYSVIPC
-	default y
-
 endmenu