[Patch] libstdc++/28080: tr1/random

[Paolo Carlini]

Hi,

some tr1/random bits: the idea is avoiding the heavy <fstream> and use 
instead <cstdio> facilities for the simple goals of random_device: then, 
by tweaking all the inserters and extractors as we already did elsewhere 
to refer to ios_base as a base of basic_istream or basic_ostream, we can 
end up including only <cstdio> and <iosfwd>, thus obtaining a 
preprocessed <tr1/random> about half the size. There is an ABI issue in 
random_device, because we have now a FILE* member instead, but since we 
never released <tr1/random> we can elegantly solve the issue by applying 
this patch to 4_2-branch too, besides mainline.

Tested x86-linux.

Paolo.

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