[PATCH libdrm] configure.ac: bring back pthread-stubs check

[Emil Velikov]

On 31 March 2017 at 00:17, Eric Engestrom <eric at engestrom.ch> wrote:
> On Thursday, 2017-03-30 18:01:12 +0100, Emil Velikov wrote:
>> Accidentally removed with earlier commit. Although rather than simply
>> adding the check for all platforms, use the same heuristics as we do in
>> mesa.
>>
>> Namely: pthread-stubs is a thing only for BSD platforms. Everyone else
>> should have lightweight pthread API in their C runtime library.
>>
>> Fixes: 4ecd1ef010b ("xf86drm: fix null termination of string buffer")
>> Signed-off-by: Emil Velikov <emil.l.velikov at gmail.com>
>
> Reviewed-by: Eric Engestrom <eric at engestrom.ch>
>
Thanks. Pushed to master.

-Emil