Remove NEED_BSDTTY and NEED_UNISTD_H.
* s/hpux10-20.h (NEED_BSDTTY): Remove. * s/aix4-2.h (NEED_UNISTD_H): Remove. * systty.h: Simplify conditionals for including <sys/bsdtty.h>, <sys/ptyio.h> and <unistd.h>.
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