Revert "MS Windows compatibility, issue stephpy#34"

This reverts commit 4f41742.

Author: stephpy

autoload/php_cs_fixer.vim

@@ -20,16 +20,7 @@ else
 end
 
 " Check the php-cs-fixer version
-if (has('win32') || has('win64'))
-  if empty(matchstr(&shell, 'powershell'))
-    echoerr('This plugin requires PowerShell in Windows')
-    finish
-  else
-    let g:php_cs_fixer_version = system("(Select-String -InputObject (" . g:php_cs_fixer_version_command . ") -Pattern " . shellescape("\"([0-9])\\.\"") . ").Matches.Groups.Groups[1].value\"")
-  endif
-else
-  let g:php_cs_fixer_version = system(g:php_cs_fixer_version_command . " | sed -e 's/[^0-9.]*\\([0-9.]*\\).*/\\1/'")
-endif
+let g:php_cs_fixer_version = system(g:php_cs_fixer_version_command . " | sed -e 's/[^0-9.]*\\([0-9.]*\\).*/\\1/'")
 
 if g:php_cs_fixer_version >= 2
     let g:php_cs_fixer_rules = get(g:, 'php_cs_fixer_rules', '@PSR2')