Really symlink the Makefile properly

Change-Id: I69b31757cfb7758a1903cb44efefd9f37a62b3a8
diff --git a/kokoro/continuous.sh b/kokoro/continuous.sh
index 1a177ef..6cc1e6f 100644
--- a/kokoro/continuous.sh
+++ b/kokoro/continuous.sh
@@ -4,7 +4,7 @@
 
 # Symlink the Makefile, like it would be if repo checked this out.
 # Otherwise, sourcing setup.sh doesn't work as expected.
-ln -sfr git/build/Makefile git/Makefile
+ln -sfr git/continuous-build/build/Makefile git/continuous-build/Makefile
 source git/continuous-build/build/setup.sh
 TARBALL_FETCH_ROOT_DIRECTORY=${KOKORO_GFILE_DIR} m