git: contrib/libpcap: Update README.DRAGONFLY

[Aaron LI]

commit 8cc3b6f660b48aafc074f690552c9b0074a67c67
Author: Aaron LI <aly at aaronly.me>
Date:   Sun May 17 12:35:29 2020 +0800

    contrib/libpcap: Update README.DRAGONFLY

Summary of changes:
 contrib/libpcap/README.DRAGONFLY | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/8cc3b6f660b48aafc074f690552c9b0074a67c67


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