Upgrade to a new Bazel version

This one has better performance and various new features. It also
prevents us from falling too far behind upstream.

Change-Id: I3b8e1c5bda886ea2e990523af9e6de2434c784be
diff --git a/compilers/linaro_linux_gcc_4.9.BUILD b/compilers/linaro_linux_gcc_4.9.BUILD
index c1d40b5..52748d5 100644
--- a/compilers/linaro_linux_gcc_4.9.BUILD
+++ b/compilers/linaro_linux_gcc_4.9.BUILD
@@ -91,7 +91,8 @@
     'libexec/**',
     'lib/gcc/arm-linux-gnueabihf/**',
     'include/**',
-  ], [
+  ],
+  exclude=[
     # Exclude empty files so Bazel's caching works.
     # TODO(Brian): remove this once the Bazel bug is fixed.
     '**/.install',