patch 8.0.1718: terminal scrollback test fails on MS-Windows

Problem:    Terminal scrollback test fails on MS-Windows.
Solution:   Check for the last line of output anticipating there might be an
            empty line below it.

src/testdir/test_terminal.vim

@@ -281,7 +281,8 @@ func Test_terminal_scrollback()
    call term_sendkeys(buf, "cat Xtext\<CR>")
  endif
  let rows = term_getsize(buf)[0]
  call WaitFor({-> term_getline(buf, rows - 1) =~ '149'})
  " On MS-Windows there is an empty line, check both last line and above it.
  call WaitFor({-> term_getline(buf, rows - 1) . term_getline(buf, rows - 2) =~ '149'})
  let lines = line('$')
  call assert_inrange(91, 100, lines)

src/version.c

@@ -762,6 +762,8 @@ static char *(features[]) =

static int included_patches[] =
{   /* Add new patch number below this line */
/**/
    1718,
/**/
    1717,
/**/