stubs: move Xen stubs to accel/

Keep them close to the other accelerator-dependent stubs, so as to remove
stubs that are not needed by tools.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

accel/stubs/xen-stub.c

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2014       Citrix Systems UK Ltd.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/xen/xen.h"
+#include "qapi/qapi-commands-misc.h"
+
+void xenstore_store_pv_console_info(int i, Chardev *chr)
+{
+}
+
+int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
+{
+    return -1;
+}
+
+void xen_piix3_set_irq(void *opaque, int irq_num, int level)
+{
+}
+
+void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len)
+{
+}
+
+void xen_hvm_inject_msi(uint64_t addr, uint32_t data)
+{
+}
+
+int xen_is_pirq_msi(uint32_t msi_data)
+{
+    return 0;
+}
+
+qemu_irq *xen_interrupt_controller_init(void)
+{
+    return NULL;
+}
+
+void xen_register_framebuffer(MemoryRegion *mr)
+{
+}
+
+void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory)
+{
+}
+
+void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
+{
+}