x86/dump: save gpregs_case

Missed has_gpregs_case and on restore it's always native task.

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/arch/x86/crtools.c

@@ -280,6 +280,7 @@ static int save_task_regs(CoreEntry *core,
 		assign_reg(gpregs, regs->compat, ss);
 		gpregs->mode = USER_X86_REGS_MODE__COMPAT;
 	}
+	gpregs->has_gpregs_case = true;
 
 	if (!fpregs)
 		return 0;