[Patch] Fix libstdc++/9439 and libstdc++/9425

[Paolo Carlini]

Hi,

so here it is. In fact, these changes _should_ be pretty
safe: basic_filebuf::seekoff is currently the _only_ user
of _M_file.seekoff return value and we always do the same
as before when _M_file.seekoff doesn't fail.

However, it may turn out to be useful elsewhere to start
checking _M_file.seekoff return value...

Tested x86-linux, as usual. Ok for trunk? 3_3 too?

Paolo.

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