[Patch] Fix libstdc++/15002 (continued)

[Paolo Carlini]

Hi Pétur, hi all,

the below implements your suggestion. This is what I get here,
performance-wise:

current mainline
----------------
0.970u 0.100s 0:01.06 100.9%    0+0k 0+0io 201pf+0w

old tentative patch using sungetc()
-----------------------------------
0.600u 0.090s 0:00.69 100.0%    0+0k 0+0io 202pf+0w

this patch
----------
0.210u 0.100s 0:00.31 100.0%    0+0k 0+0io 202pf+0w

Nice!

Pétur, do you like the final result? Regtesting is OK, and if I
don't hear from you, will test a little more and then commit to
mainline only, of course (for now).

Paolo.

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