[Patch, trunk] Remove _M_out_buf_size()

[Paolo Carlini]

Hi,

this is an almost obvious cleanup in the light of the commit
for 9404: note, in particular, how the various functions in
include/bits/streambuf.tcc become _perfectly_ symmetric as
far as the initial check is concerned (i.e., sputc vs sbumpc;
xsputn vs xsgetn).

Tested x86-linux, if nobody complains I will apply the patch
in 1 day.

Paolo.

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