Windows working now

Docs for jab_start actually recommend passing the command as a string in
Windows and a list in Unix. Go figure.

plugin/makejob.vim

@@ -90,22 +90,6 @@ function! s:Expand(input)
     return join(l:expanded_input)
 endfunction
 
-" Credit to Tim Pope for the magic here
-function! s:Escape(str)
-    if has('win32') || has('win64')
-        if &shellxquote ==# '"'
-            return '"' . substitute(a:str, '"', '""', 'g') . '"'
-        else
-            let l:esc = exists('+shellxescape') ? &shellxescape : '"&|<>()@^'
-            return &shellxquote .
-                  \ substitute(a:str, '['.l:esc.']', '^&', 'g') .
-                  \ get({'(': ')', '"(': ')"'}, &shellxquote, &shellxquote)
-        endif
-    else
-        return a:str
-    endif
-endfunction
-
 function! s:MakeJob(grep, lmake, grepadd, bang, ...)
     let l:make = a:grep ? s:Expand(&grepprg) : s:Expand(&makeprg)
     let l:prog = split(l:make)[0]
@@ -135,7 +119,9 @@ function! s:MakeJob(grep, lmake, grepadd, bang, ...)
             let l:make = l:make.' '.l:arg
         endif
 
-        let l:make = [&shell, &shellcmdflag, s:Escape(l:make)]
+        if !has('win32') && !has('win64')
+            let l:make = [&shell, &shellcmdflag, l:make]
+        endif
     endif
 
     let l:opts = { 'close_cb' : function('s:JobHandler'),