Add build/bazel_common_rules to mock bazel directories.

Test: build/soong/tests/run_integration_tests.sh
Change-Id: I647d122b5fc530b5a26bd69c141d3fdc9cca7424
diff --git a/tests/lib.sh b/tests/lib.sh
index 0c78cdf..69ad201 100644
--- a/tests/lib.sh
+++ b/tests/lib.sh
@@ -116,6 +116,7 @@
 
 function create_mock_bazel {
   copy_directory build/bazel
+  copy_directory build/bazel_common_rules
 
   symlink_directory prebuilts/bazel
   symlink_directory prebuilts/clang