runtime: don't build test files that use SetCgoTraceback for gccgo
The gofrontend doesn't support the runtime.SetCgoTraceback function, which is specifically for handling mixed Go and C tracebacks. Use a build tag to avoid compiling the runtime/testdata/testprogcgo files that refer to SetCgoTraceback. These files are not currently compiled anyhow, but they will be with a future gotools patch. Reviewed-on: https://go-review.googlesource.com/46452 From-SVN: r249556
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