patch 9.0.0410: struct member cts_lnum is unused

Problem:    Struct member cts_lnum is unused.
Solution:   Delete it.
diff --git a/src/charset.c b/src/charset.c
index b26ebb9..79a2815 100644
--- a/src/charset.c
+++ b/src/charset.c
@@ -950,7 +950,6 @@
 {
     CLEAR_POINTER(cts);
     cts->cts_win = wp;
-    cts->cts_lnum = lnum;
     cts->cts_vcol = col;
     cts->cts_line = line;
     cts->cts_ptr = ptr;
diff --git a/src/structs.h b/src/structs.h
index 6e679e2..6e29785 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -4599,7 +4599,6 @@
 // Argument for lbr_chartabsize().
 typedef struct {
     win_T	*cts_win;
-    linenr_T	cts_lnum;	    // zero when not using text properties
     char_u	*cts_line;	    // start of the line
     char_u	*cts_ptr;	    // current position in line
 #ifdef FEAT_PROP_POPUP
diff --git a/src/version.c b/src/version.c
index 746852a..0d6cc89 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    410,
+/**/
     409,
 /**/
     408,