termio.h is obsolete

[barak]

There is logic to use either termio.h or termios.h, but (a) the case on architecture is done multiple times, both for the #include and later for the usage, and (b) according to termio(7)

The termio interface is now obsolete: POSIX.1-1990 standardized ... termios.

so termios.h should be used in preference to termio.h wherever possible.

This issue breaks building ChucK on a couple Debian architectures, namely Hurd and kfreebsd, where an attempt to include termio.h fails because it does not exist, but termios.h is available. See build log for details.

[barak]

Pull request #228 addresses this issue.