prefix pseudo-tty

[$system==aix]
# being investigated under https://github.com/nodejs/node/issues/9728
test-tty-wrap              : FAIL, PASS

[$system==solaris]
# https://github.com/nodejs/node/pull/16225 - `ioctl(fd, TIOCGWINSZ)` seems
# to fail with EINVAL on SmartOS when `fd` is a pty from python's pty module.
test-tty-stdout-resize     : FAIL, PASS