Benchmark submodule fails to build on ppc64.

[mandlebug]

Building the Protobuf C++ benchmark on a PowerPC cpu fails because the submodule version of google/benchmark that protbuf uses is broken on powerpc. A Commit merged in #3822 was supposed to fix this but the submodule commit that the git link points to now is earlier then the commit needed to unbreak the PowerPC build.

git submodule status
-360e66c1c4777c99402cf8cd535aa510fee16573 third_party/benchmark

git show 360e66c1c4777c99402cf8cd535aa510fee16573
commit 360e66c1c4777c99402cf8cd535aa510fee16573
Merge: 336fd11 fa0e7ef
Author: Dominic Hamon <dominichamon@users.noreply.github.com>
Date:   Wed May 11 12:07:59 2016 -0700

The commit needed to fix the powerpc build is

commit fef203bd021bad019421abf5785a4ae89bd6ea15
Author: guray <guray.ozen@gmail.com>
Date:   Mon Jan 30 21:50:21 2017 +0100

    Fix typename for powerpc (#337)

[BSBandme]

Sorry for the accident rolling back

[mandlebug]

I've verified the fix by compiling natively on a Power8 machine. Thank you for the the fast turnaround, its appreciated!