[patch] libstdc++/66011 Fix various filesystem operations

[Jonathan Wakely]

The PR is due to missing the third argument to open(3) but there are
some other errors in the same function as well as some unimplemented
features, and some bad error handling elsewhere.

The autoconf check for sendfile is intentionally conservative because
some BSDs define a sendfile() function with different semantics (it
can only copy a file to a socket, not another regular file).

Tested powerpc64le-linux, committed to trunk.

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