patch 9.0.0080: compiler warning for size_t to int conversion

Problem:    Compiler warning for size_t to int conversion.
Solution:   Add type casts. (Mike Williams, closes #10795)

src/charset.c

@@ -1095,7 +1095,7 @@ win_lbr_chartabsize(
 		char_u *p = ((char_u **)wp->w_buffer->b_textprop_text.ga_data)[
 							       -tp->tp_id - 1];
 		// TODO: count screen cells
-		cts->cts_cur_text_width = STRLEN(p);
+		cts->cts_cur_text_width = (int)STRLEN(p);
 		size += cts->cts_cur_text_width;
 		break;
 	    }

src/drawline.c

@@ -1524,7 +1524,7 @@ win_line(
 			if (p != NULL)
 			{
 			    p_extra = p;
-			    n_extra = STRLEN(p);
+			    n_extra = (int)STRLEN(p);
 			    extra_attr = used_attr;
 			    n_attr = n_extra;
 			    text_prop_attr = 0;

src/version.c

@@ -735,6 +735,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    80,
 /**/
     79,
 /**/