[Patch, libgfortran] Fix PR26499 End of File incorrectly positioned after binary I/O.

[Jerry DeLisle]

:REVIEWPATCH:

This is the third installment of this patch.  Dale developed a test program that 
tests many combinations using rewind instead of backspace and found another failure.

The attached revised patch is against current trunk and replaces the previous 
two patches I submitted.  I will include the test cases already given plus one more.

Once again, OK for trunk and 4.1.1?   (Sorry for the repeats, but I fix them as 
they come.)

Regards,

Jerry

2006-03-03  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libgfortran/26499
	* io/file_pos (st_rewind): Flush always.
	* io/unix.c (fd_truncate): Return SUCCESS rather than FAILURE for
	special files like /dev/null.
	* io/transfer.c (st_write_done): Remove broken logic that prevented
	calling fd_truncate.
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