Fix typo in previous commit.

Change-Id: Id7ebb2b95173c4ba41f15849c9b95f0b7985a896
diff --git a/tools/archive.py b/tools/archive.py
index 8b70d86..ad58bca 100755
--- a/tools/archive.py
+++ b/tools/archive.py
@@ -84,7 +84,7 @@
 
   # Generate an r8-ed build without dependencies.
   # Note: build_r8lib does a gradle-clean, this must be the first command.
-  build_r8lib('r8', True, True, utils.R8_KEEP_RULES, utils.R8_EXCLUDE_DEPS_JAR)
+  build_r8lib('r8', True, True, utils.R8LIB_KEEP_RULES, utils.R8_EXCLUDE_DEPS_JAR)
 
   # Create maven release which uses a build that exclude dependencies.
   create_maven_release.main(["--out", utils.LIBS])