Added call to pcap_can_set_rfmon before calling pcap_set_rfmon.
Added call to pcap_can_set_rfmon before calling pcap_set_rfmon.

wavelets/libtins,rklabs/libtins,salessandri/libtins,viveks9/decrypt80211,mfontanini/libtins,hanw/libtins,UlfWetzker/libtins,zmb3/libtins,viveks9/decrypt80211,bowlofstew/libtins,salessandri/libtins,bowlofstew/libtins,UlfWetzker/libtins,hanw/libtins,rklabs/libtins,wavelets/libtins,capturePointer/libtins,mfontanini/libtins,capturePointer/libtins,zmb3/libtins