unix: retry ioctl(TIOCGWINSZ) on EINTR
unix: retry ioctl(TIOCGWINSZ) on EINTR

Some platforms (notably Solaris) can fail in this ioctl() if interrupted
by a signal.  Retry the system call when that happens.

Fixes: https://github.com/nodejs/node/issues/5737
PR-URL: https://github.com/libuv/libuv/pull/772
Reviewed-By: Colin Ihrig <838f779c91673db29b8572ea3f54d191d3878ae2@gmail.com>

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