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

[Andreas Schwab]

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?

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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