[release-branch.go1.13] cmd/go: fix and skip known Windows test failures
    
    These non-short Windows test failures were resolved fully in CL 206144.
    
    Both TestScript/build_trimpath and TestScript/version tests can be fixed
    by backporting the changes to test scripts only, so that is done here.
    
    Fixing TestScript/mod_list_dir requires backporting non-test changes in
    addition to the test script changes, which is unlikely to be appropriate
    this late in Go 1.13 release cycle. A failing test can cover up other
    regressions, so skip this known failing test to fix the builder.
    
    For #36181.
    
    Change-Id: I4f140bd373554eb4664f04638666dee77986ec3e
    Reviewed-on: https://go-review.googlesource.com/c/go/+/223782
    Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: Jay Conrod <jayconrod@google.com>