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/option.h b/src/option.h
index c1a25b3..76d67d9 100644
--- a/src/option.h
+++ b/src/option.h
@@ -1161,6 +1161,7 @@
 #ifdef FEAT_SYN_HL
     , WV_CUC
     , WV_CUL
+    , WV_CULOPT
     , WV_CC
 #endif
 #ifdef FEAT_STL_OPT