android: Fix build on Android
android: Fix build on Android

external/bluetooth/bluez/attrib/gattrib.c:82: error:
    undefined reference to 'bt_att_new'
external/bluetooth/bluez/attrib/gattrib.c:99: error:
    undefined reference to 'bt_att_unref'
external/bluetooth/bluez/attrib/gattrib.c:150: error:
    undefined reference to 'bt_att_unref'
external/bluetooth/bluez/attrib/gattrib.c:274: error:
    undefined reference to 'bt_att_send'
external/bluetooth/bluez/attrib/gattrib.c:285: error:
    undefined reference to 'bt_att_cancel_all'
external/bluetooth/bluez/attrib/gattrib.c:309: error:
    undefined reference to 'bt_att_register'
external/bluetooth/bluez/attrib/gattrib.c:330: error:
    undefined reference to 'bt_att_set_mtu'
external/bluetooth/bluez/attrib/gattrib.c:335: error:
    undefined reference to 'bt_att_unregister'
collect2: error: ld returned 1 exit status

silent-snowman/bluez,mapfau/bluez,pstglia/external-bluetooth-bluez,ComputeCycles/bluez,silent-snowman/bluez,mapfau/bluez,pkarasev3/bluez,ComputeCycles/bluez,pkarasev3/bluez,mapfau/bluez,ComputeCycles/bluez,pkarasev3/bluez,pstglia/external-bluetooth-bluez,mapfau/bluez,pstglia/external-bluetooth-bluez,ComputeCycles/bluez,silent-snowman/bluez,silent-snowman/bluez,pkarasev3/bluez,pstglia/external-bluetooth-bluez