[v3] Revert 2005-01-05 istream::ignore change

[Paolo Carlini]

Hi,

thinking more about the issue, I'm convinced the previous behavior
was correct, albeit slightly different from that of 3.3 in a corner
case (i.e., now if eof/delim immediately follows the n-th char, we
set eof/eat the delim) due to the use of snextc. Indeed, the very
same behavior wrt eof can be seen in get(char_type*, streamsize,
char_type).

Sorry.

Tested x86-linux.

Paolo.

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