patch 9.0.0007: no support for double, dotted and dashed underlines

Problem:    No support for double, dotted and dashed underlines.
Solution:   Add the termcap entries and highlight modes. (closes #9553)
diff --git a/src/optiondefs.h b/src/optiondefs.h
index aca3737..03e472f 100644
--- a/src/optiondefs.h
+++ b/src/optiondefs.h
@@ -2893,9 +2893,9 @@
     p_term("t_BD", T_BD)
     p_term("t_cd", T_CD)
     p_term("t_ce", T_CE)
+    p_term("t_Ce", T_UCE)
     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)
@@ -2905,6 +2905,8 @@
     p_term("t_db", T_DB)
     p_term("t_DL", T_CDL)
     p_term("t_dl", T_DL)
+    p_term("t_ds", T_DS)
+    p_term("t_Ds", T_CDS)
     p_term("t_EC", T_CEC)
     p_term("t_EI", T_CEI)
     p_term("t_fs", T_FS)
@@ -2952,6 +2954,7 @@
     p_term("t_u7", T_U7)
     p_term("t_ue", T_UE)
     p_term("t_us", T_US)
+    p_term("t_Us", T_USS)
     p_term("t_ut", T_UT)
     p_term("t_vb", T_VB)
     p_term("t_ve", T_VE)