Using meta/recipes-connectivity/libpcap/libpcap_1.1.1.bb, the pcap-config utility is packaged in libpcap and not libpcap-dev (using RPM packaging, is that's relevant).
This change is much greater than simply moving some files around for packaging, it uncovered a larger issue. I am going to move this to 1.3 only as it's been this way for a while and does not harm anything to remain this way.
This was fixed by reordering the PACKAGES list to place ${PN} at the end and correctly mapping the -config files into ${PN}-dev. This was a large change set starting at http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=f68cbf56d8f2a45ce44a59d0411cdda8ec7e2c36
Verified with commit fb53d69d9c726e6a663ea276cc440676e20f8326