patch 8.1.1665: crash when popup window with mask is below the screen

Problem:    Crash when popup window with mask is below the screen.
Solution:   Correct boundary check.
diff --git a/src/version.c b/src/version.c
index 68b5465..9d012bd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1665,
+/**/
     1664,
 /**/
     1663,