Get stuff building with newer Bazel with sandboxing

After this, a newer version of Bazel is required to build the code.
201511240708+4433fa6 is the first version which will work.

Change-Id: Ifc41f11f2f21bdcd0f5f7d142d769ea8fa15921a
diff --git a/tools/cpp/arm-frc-linux-gnueabi/BUILD b/tools/cpp/arm-frc-linux-gnueabi/BUILD
index 4548dbe..64342a9 100644
--- a/tools/cpp/arm-frc-linux-gnueabi/BUILD
+++ b/tools/cpp/arm-frc-linux-gnueabi/BUILD
@@ -17,6 +17,14 @@
 )
 
 filegroup(
+  name = 'as',
+  srcs = [
+    '@arm-frc-linux-gnueabi-repo//:as',
+    'arm-frc-linux-gnueabi-as',
+  ],
+)
+
+filegroup(
   name = 'ld',
   srcs = [
     '@arm-frc-linux-gnueabi-repo//:ld',
@@ -61,6 +69,7 @@
   srcs = [
     ':gcc',
     ':ar',
+    ':as',
     ':ld',
     ':nm',
     ':objcopy',