Split ttyname.c to avoid unnecessary dependencies

[Sebastian Huber <sebastian dot huber at embedded-brains dot de>]

Hi,

the two functions ttyname() and ttyname_r() are currently defined in one file

libc/unix/ttyname.c

The ttyname() function needs 1030 bytes of data (with common _PATH_DEV and
MAXNAMLEN values).  This is quite much if you have a system with a small memory
space.  The file should be split up into ttyname.c and ttyname_r.c to avoid
this memory requirement if you only use ttyname_r().

Have a nice day!

-- 
Sebastian Huber, Embedded Brains GmbH

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