[google] Disable RDRAND bits when building with Clang

[Evgeniy Stepanov]

re-sending the patch

On Mon, May 13, 2013 at 5:54 PM, Evgeniy Stepanov <eugenis@google.com> wrote:
> friendly ping
>
> On Mon, Apr 22, 2013 at 5:23 PM, Evgeniy Stepanov <eugenis@google.com> wrote:
>> Hi,
>>
>> this patch disables rdrand in c++11/random.cc when building with Clang
>> compiler. Current Clang misses a number of definitions needed to build
>> that.
>>
>> Is it OK for google/gcc-4_8 and google/main (or google/integration?) ?
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