[committed 3/3] libstdc++: Allow net::io_context to compile without <poll.h> [PR 100180]

[Jonathan Wakely]

This adds dummy placeholders to net::io_context so that it can still be
compiled on targets without <poll.h>.

Tested powerpc64le-linux and sparc-solaris. Committed to trunk.

This could be backported so that it fixes PR 100180 everywhere, but
after the gcc-11 release.


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