[RFC / patch] Autoconf test to avoid inclusion of <cstdio>

[Paolo Carlini]

... this version of the idea is *much* simpler and safer, but anyway effective because EOF == -1, SEEK_CUR == 1, SEEK_END == 2, are by far the most common values (AFAIK).

I'm finishing testing it on x86_64-linux (without PCHs; earlier today I checked is also effective on i386-darwin), then I mean to apply it very soon... 

Paolo.

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