Log Message:
Update to 5.2.1. The old distfile is a symlink to this now.

I don't know what changed.

I removed the patches. They did not apply and they files are gone
or context is changed.

Now depend on libpcap via buildlink3.mk. I think the patches
I removed were for a provided version of libpcap.

Use INSTALLATION_DIRS for share/examples/trafshow instead of
INSTALL_DATA_DIR.

Note that the /etc/trafshow is hard-coded. I didn't patch this.