collectd: use python3

, perl

, postgresql

, protobufc

, python2

, python3

, rabbitmq-c

, rdkafka

, riemann_c_client

    pinba.buildInputs = [ protobufc ];

    ping.buildInputs = [ liboping ];

    postgresql.buildInputs = [ postgresql ];

    python.buildInputs = [ python2 ];

    python.buildInputs = [ python3 ];

    redis.buildInputs = [ hiredis ];

    rrdcached.buildInputs = [ rrdtool libxml2 ];

    rrdtool.buildInputs = [ rrdtool libxml2 ];