[Patch] Avoid using _M_move_out_cur in stringbuf/seeks

[Paolo Carlini]

Hi,

this only a first preparatory step toward major changes to
stringbuf and filebuf: elimination of _M_out_lim, simplification
of _M_move_in_cur and _M_move_out_cur to pbump and gbump.

Anyway, the below is really simple minded: we cannot seek
beyond _M_out_lim, therefore _M_move_out_cur boils down
to simply updating _M_out_cur. Overall, the code becomes
simpler and symmetric get area <-> put area.

Tested x86-linux, ok with you?

Paolo.

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