[Patch, libgfortran] Remove move_pos_offset

[Janne Blomqvist]

Hi,

move_pos_offset is nowadays not needed anymore. Back with the old low
level I/O library, the sseek function didn't have a whence argument, but
now the same functionality is provided by sseek(..., SEEK_CUR). The
attached patch removes said function, and updates callers.

Regtested on i686-pc-linux-gnu, though with lots of ICE's due to some
other patch, but no I/O regressions it seems.

Ok for trunk?

-- 
Janne Blomqvist
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