patch 8.1.1755: leaking memory when using a popup window mask

Problem:    Leaking memory when using a popup window mask.
Solution:   Free the cached mask.
diff --git a/src/version.c b/src/version.c
index 1ae8910..8518667 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1755,
+/**/
     1754,
 /**/
     1753,