compat/poll: prepare for targeting Windows Vista #32
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Windows Vista (and later) actually have a working poll(), but we still
cannot use it because it only works on sockets.
So let's detect when we are targeting Windows Vista and undefine those
constants, and define
pollfd
so that we can declare our own pollfdstruct.
We also need to make sure that we override those constants after
winsock2.h
has been#include
d (otherwise we would not reallyoverride those constants).
(Stolen from @jeffhostetler's PR, thanks to @dscho)