Makefile.am:3462: warning: $(src_devices_bluetooth_libnm_device_plugin_bluetooth_la_OBJECTS) was already defined in condition TRUE, which includes condition WITH_MODEM_MANAGER_1 ...
 Makefile.am:960: ... '$(src_devices_bluetooth_libnm_device_plugin_bluetooth_la_OBJECTS)' previously defined here

Fixes: 878d4963 ('bluetooth/tests: add "nm-bt-test helper" program for manual testing of bluetooth code')