libpcap was not previously installing a pkg-config file. Add a basic one
that will allow using 'pkg-config --libs libpcap', for example, in recipes
rather than 'pcap-config', which frequently returns incorrect information.
(From OE-Core rev: 0f51c1260ac53aa4843e29b00cd600eb64074260)
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
de638414f7