Force standalone until we are ready to sandbox better.

Change-Id: I85e038735da1caac9c3addb9cce6c55221a42dd2
diff --git a/tools/bazel.rc b/tools/bazel.rc
index b06ea73..6d5dc61 100644
--- a/tools/bazel.rc
+++ b/tools/bazel.rc
@@ -5,6 +5,7 @@
 query --package_path %workspace%:%workspace%/opt_bazel_base_workspace
 
 build --crosstool_top=//tools/cpp:toolchain
+build --spawn_strategy=standalone
 
 # Show paths to a few more than just 1 target.
 build --show_result 15