[Bug libstdc++/67408] <mutex> assumes that __gthread_mutex_t and__gthread_recursive_mutex_t are the same types

[sebastian.huber@embedded-brains.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67408

--- Comment #9 from Sebastian Huber <sebastian.huber@embedded-brains.de> ---
(In reply to Jonathan Wakely from comment #8)
> There's no need to test on linux, I can do that myself. If it works on your
> non-pthreads target I'll commit your patch.

Here it works fine:

https://lists.rtems.org/pipermail/devel/2015-September/012445.html