patch 9.0.0181: textprop test with line2byte() fails on MS-Windows

Problem:    Textprop test with line2byte() fails on MS-Windows.
Solution:   Fix updating chuncks in ml_delete_int().
diff --git a/src/version.c b/src/version.c
index a7d3d07..4390497 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    181,
+/**/
     180,
 /**/
     179,