patch 8.0.1664: test failure because of not allocating enough space

Problem:    Test failure because of not allocating enough space.
Solution:   Allocate more bytes.
diff --git a/src/version.c b/src/version.c
index 4d19b47..a9b4dca 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1664,
+/**/
     1663,
 /**/
     1662,