bug#18101: gccgo fails to build (all platforms)

[Mark H Weaver]

At the very end of the builds for gccgo, there is an error:

  cycle detected in the references of `/gnu/store/*-gccgo-4.8.3-lib'

and that causes the build to fail.

I wonder if this is fallout from when the gcc packages had their libs
split into a different output.  Maybe the "lib" and "out" outputs of
gccgo reference each other, and perhaps this is a problem?

     Mark