kien/ctrlp.vim — pull request #598 by Chronial (2014-07-26 15:58:15+00:00)
Title: Check shell in Windows before assuming cmd.exe

In Windows, some users set the Cygwin shell as their Vim shell, consider
this before rewriting `cd` calls. Checking if `shellcmdflag` contains a
backslash should catch all true windows shells.

Without this fix, user list commands are broken with a cygwin shell.