darwin: xnu doesn't support poll on ttys on the master side.
darwin: xnu doesn't support poll on ttys on the master side.

<rdar://problem/7360546>

Signed-off-by: Jeremy Huddleston <db3cec0cba09acb9cf8fd8bd399a3b27498cf883@freedesktop.org>

topcat/xcb-win32,topcat/xcb-win32,stapelberg/libxcb,topcat/xcb-win32,topcat/xcb-win32,stapelberg/libxcb,stapelberg/libxcb,topcat/xcb-win32