[COMMITTED] Remove useless comment from sysdeps/sparc/sparc32/dl-machine.h

[David Miller]

From: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date: Tue, 23 May 2017 01:17:33 +0530

> David Miller has not been shot yet AFAIK (yes, I googled for any news
> that may seem relevant and I poked him on twitter some days ago) so
> either nobody uses SPARC or the code is correct or nobody read the
> instructions in the comment to shoot him.  In all of those cases the
> comment is clearly not useful, so getting rid of it.

This looks fine :)