[Patch/RFC] Speed-up istreambuf_iterator and... sorry Jon!

[Paolo Carlini]

... actually, the patch can be simpler, and the result even more
efficient: operator++() and operator++(int) were already resetting
_M_c to eof when really necessary! :)

current
=======
6.130u 0.000s 0:06.16 99.5%     0+0k 0+0io 205pf+0w

iter patched (new)
==================
4.390u 0.000s 0:04.41 99.5%     0+0k 0+0io 202pf+0w

(regtested x86-linux)

Paolo.

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