parasite-vdso: vdso_map_compat under CONFIG_COMPAT

  It's used in restorer to map compatible vDSO blob.
When !CONFIG_COMPAT it's not needed and even more:
vdso_fill_symtable_compat is macro and is undefined in that
case. It will never shoot, as compat_vdso is always false
for that case, but get rid of it.
  I also need to leave CONFIG_X86_64 here, as arch_prctl()
is not defined for x86_32.

Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/pie/parasite-vdso.c

@@ -68,7 +68,7 @@ int vdso_do_park(struct vdso_symtable *sym_rt, unsigned long park_at, unsigned l
 	return ret;
 }
 
-#ifdef CONFIG_X86_64
+#if defined(CONFIG_X86_64) && defined(CONFIG_COMPAT)
 #ifndef ARCH_MAP_VDSO_32
 # define ARCH_MAP_VDSO_32	0x2002
 #endif