s390/vdso: Add arch-stubs for vdso map API

That's a merge conflict between vdso patches set and s390 set.

Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: Alice Frosi <alice@linux.vnet.ibm.com>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/arch/s390/include/asm/restorer.h

@@ -40,6 +40,8 @@
 	: "0", "1", "2", "3", "4", "5", "6", "cc", "memory")
 
 #define kdat_compatible_cr()			0
+#define kdat_can_map_vdso()			0
+#define arch_map_vdso(map, compat)		-1
 
 int restore_gpregs(struct rt_sigframe *f, UserS390RegsEntry *r);
 int restore_nonsigframe_gpregs(UserS390RegsEntry *r);