TestGdbPython (in the runtime package) has been failing on the linux-s390x-ibm builder on release-branch.go1.12 starting at CL 181658 (https://build.golang.org/log/c9c6830fd79bda38aa4a7c5f1594aafccda247cb).

The failure mode appears to be unrelated to that change, so I'm guessing that something about the builder configuration may have changed..?

CC @mundaym @aclements