Split ttyname.c to avoid unnecessary dependencies

[Ralf Corsepius]

Sebastian Huber wrote:
> Howland Craig D (Craig) wrote:
>> Here is a patch that does what Sebastian requested.  I did not include
>> the regenerated Makefile.in, leaving it to Jeff to do that if it makes
>> the cut to be put in.  (I did note the regeneration in the ChangeLog.)
> 
> Thank you very much.  I would have provided a patch, but I am struggling with
> the newlib build and --enable-maintainer-mode.

Please find enclosed the missing piece ;)

Ralf
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