patch 9.0.1661: BUCK files are not recognized

Problem:    BUCK files are not recognized.
Solution:   Recognize BUCK files as "bzl". (Son Luong Ngoc, closes #12564)
diff --git a/src/version.c b/src/version.c
index ba99907..437da65 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1661,
+/**/
     1660,
 /**/
     1659,