[Patch] Simplify basic_streambuf::setg() and setp()?

[Paolo Carlini]

Hi,

this don't like specially, but, if I'm right, may help
noticeably in inlining _M_create_pback, _M_destroy_pback and
_M_set_determinate (see:

  http://gcc.gnu.org/ml/libstdc++/2003-05/msg00014.html)

The point is: I have checked the standard and a couple of
other implementations and cannot find support for the final
'if' of our current setg() and setp().

(bonus: a minor clean up of _M_destroy_pback)

Tested x86-linux. Ok?

Paolo.

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