If we don't get any OS information, remove the old OS information.

The old information is copied over from one of the input files; if we
don't have information about the OS on the machine writing the *output*
file, just throw the old information away.

(We need a better way to preserve information from the input files;
perhaps this:

   http://www.winpcap.org/pipermail/pcap-ng-format/2016-June/000362.html

might work.)

Change-Id: Ia25771736d267173f2b6949a91e81e217ee7d16f
Reviewed-on: https://code.wireshark.org/review/16730
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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