odp: put odp specific struct to private field of struct pcap

Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>
odp: use system lib and includes to find odp library

Since we switched to autotools we can expect that
odp includes and library in system default directories.

Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>
odp: do not create debian symlinks

We should not create libpcap.so.0.8 symlink here. If needed it
should be in package manager (dpkg).

Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>
odp: do not touch handle->selectable_fd

Unset handle->selectable_fd for only.

Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>