Fails on Windows with Cygwin/bash set as shell

[fnxweb]

On Windows if shell is set to bash (e.g., when using Cygwin), the custom nobbling of shellslash in s:SafeShellEscape actually breaks things, and you get E484 errors trying to use the temp file.

I've patched mine to not perform the nobble if shell is set to a shell-like filename:

if ( has("win32") || has("win64") ) && &shell !~? "sh$"

You could arguably do the opposite check against cmd.

[s3rvac]

Thank you for the report. I will check it once I am on Windows.