Temporary redirect for CMake Variables list.

Change-Id: I7d6fd1afaa342d74bbede2721a6b8d3a2117fb25
diff --git a/docs/html/_redirects.yaml b/docs/html/_redirects.yaml
index 7e7c2de..3458bdc 100644
--- a/docs/html/_redirects.yaml
+++ b/docs/html/_redirects.yaml
@@ -1282,3 +1282,6 @@
 - from: /preview/features/data-saver.html
   to: /training/basics/network-ops/data-saver.html
 
+# Temporary redirect
+- from: /ndk/guides/cmake.html
+  to: https://sites.google.com/a/android.com/tools/tech-docs/external-c-builds#TOC-CMake-Variables-List
\ No newline at end of file