[v3] libstdc++/48114

[Paolo Carlini]

Hi,

a couple of issues with the C++0x <random>, very easy to fix but very 
serious from the user point of view: due to a stupid thinko of mine we 
have been computing the binomial distribution incorrectly for p > 0.5 + 
we had the TR1 != C++0x definition for the geometric_distribution.

Both fixes applied to mainline and 4_6-branch, only the first one to 
4_5-branch.

Paolo.

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