monitor: move include files to include/monitor/

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/net/slirp.c b/net/slirp.c
index 5a11ac5..c37a5ef 100644
--- a/net/slirp.c
+++ b/net/slirp.c
@@ -32,7 +32,7 @@
 #include "net/net.h"
 #include "clients.h"
 #include "hub.h"
-#include "monitor.h"
+#include "monitor/monitor.h"
 #include "qemu_socket.h"
 #include "slirp/libslirp.h"
 #include "qemu-char.h"