Update _get_cpu_value() to fix issue #1264 
Update _get_cpu_value() to fix issue #1264 

I have tested on NVIDA Jetson TK1 and bazel was able to compile. 

I believe with this quick fix would make bazel installation on Linux ARM devices easier. I have been spending 5 hours to figure out a correct way to install bazel.

Closes #2389.

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Reviewed-on: https://github.com/bazelbuild/bazel/pull/2389
PiperOrigin-RevId: 145401787
MOS_MIGRATED_REVID=145401787

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