Global error code for the last socket operation on the calling thread

Not idempotent on all platforms.

Property definitions

libevent :: libevent $ Sys :: evutil_socket_error
# Global error code for the last socket operation on the calling thread
#
# Not idempotent on all platforms.
fun evutil_socket_error: Int `{
	return EVUTIL_SOCKET_ERROR();
`}
lib/libevent/libevent.nit:303,1--308,2