Do not vendor cookbooks using Berkshelf anymore

Instead, use the Berkshelf support in knife-solo and the
vagrant-berkshelf plugin on Vagrant

cookbooks/mingw/files/default/bash.bat

@@ -1,17 +0,0 @@
-@echo off
-set HOME=/home/%USERNAME%
-
-IF "%MSYSTEM%"=="" (
-  echo MSYSTEM is NOT defined
-  exit
-)
-
-rem Ask MSYS to initialize with a minimal path by default.
-rem This will put only the windows system paths into the msys path.
-set MSYS2_PATH_TYPE=minimal
-
-rem See /etc/profile - it should invoke post-install step 05-home-dir.post
-rem which uses this environment variable to change directories.
-set CHERE_INVOKING=1
-
-%~dp0..\usr\bin\bash.exe -l %*