[PATCH] Remove __PTHREAD_MUTEX_HAVE_ELISION undefined warning

[David Miller]

From: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Date: Wed, 09 Apr 2014 11:01:18 -0300

> Pushed upstream as 01f8eac224421f07f28f91cc05db7459ea433ea4 and CCing all the arch
> maintainers.
> 
> PS: sorry for the spam.

Thanks for taking care of this.