Fixed build failure on kernels 3.7.1 through to 3.9.9

Updated check to kernel version from 3.9.10 to 3.7.0 to represent actual time netlink_skb_parms.pid changed to netlink_skb_parms.portid
Merge pull request #2 from frank-borkin/master

Fixed build failure on kernels 3.7.1 through to 3.9.9