qemu-tool: Fix mixup of int64 and int64_t

Commit cbcfa0418f (link the main loop and
its dependencies into the tools) introduced stray usages of int64.

Use int64_t instead.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

qemu-tool.c

@@ -59,12 +59,12 @@ void monitor_protocol_event(MonitorEvent event, QObject *data)
 {
 }
 
-int64 cpu_get_clock(void)
+int64_t cpu_get_clock(void)
 {
     abort();
 }
 
-int64 cpu_get_icount(void)
+int64_t cpu_get_icount(void)
 {
     abort();
 }