The source build of the nano binary installed Go at /usr/local/go and
replaced whatever version was already there. On a host that also
builds other things, the operator's own toolchain was removed and
swapped for Felis's pinned version without a word.
GOROOT_DIR is now /opt/felis/go, next to the source, the Velocity
install and the JRE Felis already keeps under /opt/felis, and
install_go_toolchain creates the parent before unpacking. A host where
an earlier run put Go at /usr/local/go downloads it once more on the
next re-run and keeps the old tree untouched; removing it is the
operator's call. The harness now requires the toolchain directory to
be under /opt/felis.
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