patch 7.4.911
Problem:    t_Ce and t_Cs are documented but not supported. (Hirohito Higashi)
Solution:   Define the options.
diff --git a/src/option.c b/src/option.c
index 7c9f9c8..db3a197 100644
--- a/src/option.c
+++ b/src/option.c
@@ -2981,8 +2981,10 @@
     p_term("t_ce", T_CE)
     p_term("t_cl", T_CL)
     p_term("t_cm", T_CM)
+    p_term("t_Ce", T_UCE)
     p_term("t_Co", T_CCO)
     p_term("t_CS", T_CCS)
+    p_term("t_Cs", T_UCS)
     p_term("t_cs", T_CS)
 #ifdef FEAT_VERTSPLIT
     p_term("t_CV", T_CSV)