[PATCH 2/3, newlib] Only define static locks in multithreaded mode

[Thomas Preudhomme]

Hi,

I've removed the changes to lock.h as requested. Please find attached an updated 
patch in git format-patch format.

Best regards,

Thomas

On 31/01/17 17:21, Thomas Preudhomme wrote:
> And in git format-patch now.
>
> Best regards,
>
> Thomas
>
> On 31/01/17 17:10, Thomas Preudhomme wrote:
>> Hi,
>>
>> Newlib build system defines __SINGLE_THREAD__ to allow concurrency code
>> to be only compiled when newlib is configured for multithread. One such
>> example are locks which become useless in single thread mode. Although
>> most static locks are indeed guarded by !defined(__SINGLE_THREAD__),
>> some are not.
>>
>> This commit adds these missing guards to __dd_hash_mutex,
>> __atexit_recursive_mutex, __at_quick_exit_mutex and __arc4random_mutex.
>> It also makes sure locking macros in lock.h are noop in single thread
>> mode.
>>
>> Is this ok for master?
>>
>> Best regards,
>>
>> Thomas
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