[LTP] [PATCH] openposix/threads: Add missing Makefile

[Enji Cooper]

Shoot :/.. thank you for fixing that :(.

> On Dec 20, 2018, at 00:57, Petr Vorel <pvorel@suse.cz> wrote:
> 
> Hi Xiao,
> 
>> The Makefile in functional/threads directory was removed by mistake.
> 
>> Fixes: 310c9eb ("Remove explicit #define's for `_POSIX_C_SOURCE` and `_XOPEN_SOURCE`")
> 
>> Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
> 
> Thanks for your fix, merged.
> 
> 
> Kind regards,
> Petr