[committed] libstdc++: Fix broken autoconf check for O_NONBLOCK

[Jonathan Wakely]

On 26/08/21 12:46 +0100, Jonathan Wakely wrote:
>	PR libstdc++/100285
>	* configure.ac: Check for O_NONBLOCK.

This check was broken, oops. Fixed like so.

Tested x86_64-linux. Committed to trunk.


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