patch 8.0.1121: can uncheck executables in MS-Windows installer

Problem:    Can uncheck executables in MS-Windows installer.
Solution:   Make the choice read-only. (Ken Takata, closes #2106)
diff --git a/src/version.c b/src/version.c
index dae5d3f..e215d3e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1121,
+/**/
     1120,
 /**/
     1119,