Update nios2, sparc32 localplt.data files for recent GCC change [committed]

[Joseph Myers]

On Fri, 9 Jun 2017, Andreas Schwab wrote:

> On Jun 09 2017, Joseph Myers <joseph@codesourcery.com> wrote:
> 
> > A recent GCC change to expand floating-point classification built-in
> > functions inline using integer rather than floating-point arithmetic
> > in some cases resulted in localplt test failures for nios2 and sparc32
> > <https://sourceware.org/ml/libc-testresults/2017-q2/msg00320.html>.
> > This patch updates the localplt.data files in question to mark the
> > relevant symbols as optional / add a new optional symbol.
> 
> Perhaps all libgcc references should be marked optional?

Seems reasonable (the issue is actually floating-point functions that are 
defined in and exported from libc rather than libgcc on certain 
platforms).

-- 
Joseph S. Myers
joseph@codesourcery.com