Revert "Import check.vim from Vim 8.0.0794"

This reverts commit 4289d66.

The latest check.vim requires Vim 8.0.0794. It's not convenient.

Author: k-takata

src/po/check.vim

@@ -35,7 +35,6 @@ let s:save_wrapscan = &wrapscan
 set nowrapscan
 
 " Start at the first "msgid" line.
-let wsv = winsaveview()
 1
 /^msgid\>
 
@@ -111,41 +110,7 @@ if search('msgid "\("\n"\)\?\([EW][0-9]\+:\).*\nmsgstr "\("\n"\)\?[^"]\@=\2\@!')
   endif
 endif
 
-func! CountNl(first, last)
-  let nl = 0
-  for lnum in range(a:first, a:last)
-    let nl += count(getline(lnum), "\n")
-  endfor
-  return nl
-endfunc
-
-" Check that the \n at the end of the msgid line is also present in the msgstr
-" line.  Skip over the header.
-/^"MIME-Version:
-while 1
-  let lnum = search('^msgid\>')
-  if lnum <= 0
-    break
-  endif
-  let strlnum = search('^msgstr\>')
-  let end = search('^$')
-  if end <= 0
-    let end = line('$') + 1
-  endif
-  let origcount = CountNl(lnum, strlnum - 1)
-  let transcount = CountNl(strlnum, end - 1)
-  " Allow for a few more or less line breaks when there are 2 or more
-  if origcount != transcount && (origcount <= 2 || transcount <= 2)
-    echomsg 'Mismatching "\n" in line ' . line('.')
-    if error == 0
-      let error = lnum
-    endif
-  endif
-endwhile
-
 if error == 0
-  " If all was OK restore the view.
-  call winrestview(wsv)
   echomsg "OK"
 else
   exe error