patch 8.1.1635: warnings for unused variables in small version

Problem:    Warnings for unused variables in small version. (John Marriott)
Solution:   Adjust #ifdefs.
diff --git a/src/version.c b/src/version.c
index d1e12c8..634cd08 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1635,
+/**/
     1634,
 /**/
     1633,