patch 8.1.2019: 'cursorline' always highlights the whole line

Problem:    'cursorline' always highlights the whole line.
Solution:   Add 'cursorlineopt' to specify what is highlighted.
            (closes #4693)
diff --git a/src/testdir/gen_opt_test.vim b/src/testdir/gen_opt_test.vim
index a8eca74..437ad76 100644
--- a/src/testdir/gen_opt_test.vim
+++ b/src/testdir/gen_opt_test.vim
@@ -82,6 +82,7 @@
       \ 'completeslash': [['', 'slash', 'backslash'], ['xxx']],
       \ 'cryptmethod': [['', 'zip'], ['xxx']],
       \ 'cscopequickfix': [['', 's-', 's-,c+,e0'], ['xxx', 's,g,d']],
+      \ 'cursorlineopt': [['both', 'line', 'number'], ['', 'xxx', 'line,number']],
       \ 'debug': [['', 'msg', 'msg', 'beep'], ['xxx']],
       \ 'diffopt': [['', 'filler', 'icase,iwhite'], ['xxx', 'algorithm:xxx', 'algorithm:']],
       \ 'display': [['', 'lastline', 'lastline,uhex'], ['xxx']],