[PATCH] sparc32: fix sem_open.c compilation

[David Miller]

From: Brett Neumeier <bneumeier@gmail.com>
Date: Fri, 7 Aug 2015 18:38:52 -0500

> In 2.22 and master, when doing a x86_64-pc-linux-gnu to
> sparc-pc-linux-gnu cross-toolchain build, sem_open.c fails to compile
> because it can't find FUTEX_SHARED. It looks to me like an include
> directive got missed.
> 
> The attached fixes it for me on 2.22.

Looks good to me.