Windows style-on-command-line failures (Was: buildbot failure in LLVM on clang-x86-win2008-selfhost)

This bot, and possibly other windows bots, seems to fail the
style-on-command-line test pretty frequently. Anyone know how to resolve
that, or if we should disable this test on windows? writes:

We can disable it for now on Windows. The best “solution” I’ve thought of for papering over this file system semantic difference is going to be implementing our own ‘rm’ on Windows that retries the removal after waiting a bit.