damaged compilers happy. * sysdep-norm.h: Remove some crud, install dire warning.
a macro with arguments.
when both VLNEXT and TERMIOS_TTY_DRIVER is defined. On SVR4 <termio.h> includes <termios.h>, so VLNEXT is always defined. * sysdep-norm.h (_POSIX_VERSION): Define this for all SVR4 systems so that <termios.h> gets used, instead of <termio.h>.