patch 8.0.0961: the script to build the installer does not include winpty

Problem:    The script to build the installer does not include winpty.
Solution:   Add winpty32.dll and winpty-agent.exe like diff.exe
diff --git a/src/version.c b/src/version.c
index a424c6a..a25bbad 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    961,
+/**/
     960,
 /**/
     959,