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)
diff --git a/src/charset.c b/src/charset.c
index f41248b..f3d12cb 100644
--- a/src/charset.c
+++ b/src/charset.c
@@ -1095,7 +1095,7 @@
 		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;
 	    }
diff --git a/src/drawline.c b/src/drawline.c
index 666e32d..7b16457 100644
--- a/src/drawline.c
+++ b/src/drawline.c
@@ -1524,7 +1524,7 @@
 			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;
diff --git a/src/version.c b/src/version.c
index bd75074..50bf7c4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    80,
+/**/
     79,
 /**/
     78,