TESTrun: fix copy-and-pasteo.

TESTrun: fix copy-and-pasteo.

(Matters only on Windows, and we're still not ready for the check target
to be used on Windows yet; for one thing, it requires that tcpdump be
built with the latest shiniest libpcap, to handle some capture files
that use post-1.9 LINKTYPE_ values, and we aren't yet set up to do
that.)