gox does not support build of library

[dgsb]

go 1.11 has introduced the support of out of gopath repository and build with the definition of module through a go.mod at the root of the repository. When trying to build such a package with gox nothing does happens, build is just ignored.

[dgsb]

In fact I could not succeed either to run the build matrix with go 1.10 in gopath either.

[dgsb]

Only packages named main are built