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Without this, the Windows version of sunxi-fexc might not process
files correctly.

TODO: This is really "hackish" / rather awful.
Eventually we should probably get rid of the file descriptor
based approach, i.e. open() plus _setmode(), and move to stdio
FILE* instead, which can be opened with the 'b' mode flag set.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>