[PATCH] libio: Assume _LIBC, weak_alias, errno, (__set_)errno &c are defined

[Florian Weimer]

libio lives exclusively in glibc these days, so there is no reason to
preserve _LIBC conditionals.

While at it, I also removed some unnecessary indirections and conditions
on other always-defined macros (F_GETFL, EIO, etc.).

I checked that this does not change the produced binaries on i686.

Thanks,
Florian
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