vend nfc dependency broken

[stigok]

After a # pacman -Syu, vend broke.

[stigok]

It seems as if it doesn't load the nfc git submodule in the git repo, but haven't really dug too deep

[stigok]

Dependency fixed by compiling and installing the nfc-bindings from source in the git submodule.
But now it doesn't respond on MQTT messages

[krav]

There was a change in the nfc-bindings module not in upstream fix a locking thing, should be in nfc-bindings in /opt/nfcd

[stigok]

Maybe nfcpy/nfcpy will be a better road.

I will test and see what happens when running python -m nfc using that library on a Pi connectected with an NFC device connected over i2c.

[stigok]

Actually, i2c is out of question as it's not supported. However, the readers we currently have available can be connected through UART connectors. More information and discussion on the subject: nfcpy/nfcpy#76