win: enable more functional tests

- plugin/shada_spec.lua: Use \r\n as Windows EOL for tests on
  BufWriteCmd, FileWriteCmd, FileAppendCmd. Alternative is 'set
  fileformat=unix'.

test/functional/options/autochdir_spec.lua

@@ -3,8 +3,6 @@ local clear = helpers.clear
 local eq = helpers.eq
 local getcwd = helpers.funcs.getcwd
 
-if helpers.pending_win32(pending) then return end
-
 describe("'autochdir'", function()
   it('given on the shell gets processed properly', function()
     local targetdir = 'test/functional/fixtures'
@@ -12,9 +10,10 @@ describe("'autochdir'", function()
     -- By default 'autochdir' is off, thus getcwd() returns the repo root.
     clear(targetdir..'/tty-test.c')
     local rootdir = getcwd()
+    local expected = rootdir .. '/' .. targetdir
 
     -- With 'autochdir' on, we should get the directory of tty-test.c.
     clear('--cmd', 'set autochdir', targetdir..'/tty-test.c')
-    eq(rootdir..'/'..targetdir, getcwd())
+    eq(helpers.iswin() and expected:gsub('/', '\\') or expected, getcwd())
   end)
 end)