net-im/libquotient: update to 0.7.1, latest upstream

This jumps to the next minor release and then a patch,
https://github.com/quotient-im/libQuotient/releases/tag/0.7.0
https://github.com/quotient-im/libQuotient/releases/tag/0.7.1

There's a bunch of new features, but e2ee support is still alpha (and off)