npm / cli / #1372

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Get correct npm prefix on all Windows unix shells

1. Set the shebang to /usr/bin/env bash instead of /bin/sh (which might
   be dash or some other shell)
2. Use Unix-style line endings, not Windows-style (Cygwin accepts
   either, but mingw bash sometimes objects, and WSL bash always does)
3. Test against paths using wslpath if available, but still pass win32
   paths to node.exe, since it is a Windows binary that only knows how
   to handle Windows paths.

The test is not quite as comprehensive as I'd like.  It runs on the
various Windows bash implementations if they are found in their expected
locations, skipping any that are not installed.  Short of shipping
mingw, cygwin, and wsl as test fixtures, I'm not sure how we could do
much better, however.  At least, we can use this test to assist debug
and catch issues on Windows machines (ours or users who report
problems).

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