cmake HAVE_LWIP examples

raspberrypi/pico-examples pico_w/bt/CMakeLists.txt :195

target_compile_definitions(picow_bt_example_cyw43_lwip_freertos INTERFACE
                HAVE_LWIP=1 # stops btstack calling lwip_init
                )

raspberrypi/pico-examples pico_w/bt/CMakeLists.txt :211

target_compile_definitions(picow_bt_example_btstack_lwip_freertos INTERFACE
                HAVE_LWIP=1 # stops btstack calling lwip_init
                )