Include <bluedroid/bluetooth.h> only if HAVE_BLUETOOTH is defined.

Change-Id: Ie679cf8b382c4d0abafc0f81ab28fa0762ff179c
diff --git a/PanController.cpp b/PanController.cpp
index e613874..08e3024 100644
--- a/PanController.cpp
+++ b/PanController.cpp
@@ -26,7 +26,9 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 
+#ifdef HAVE_BLUETOOTH
 #include <bluedroid/bluetooth.h>
+#endif
 
 #define LOG_TAG "PanController"
 #include <cutils/log.h>