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(otherwise, the gx imports won't work)

We already have this one imported into GX. Saves the effort of importing a
different one.

(need to use the canonical repository location for everything to work)

As is go build ./examples/protocol-multiplexing-with-multicodecs
will make the binary name protocol-multiplexing-with-multicodecs
so the next command ./multicodecs won't run
using -o will name the outputfile