[core] add include sys/poll.h on Solaris (fixes
x-ref:
"fdevent_solaris_port.c header missing on Solaris 10"
#ifdef FDEVENT_USE_SOLARIS_PORT
+#include <sys/poll.h>
static const int SOLARIS_PORT_POLL_READ = POLLIN;
static const int SOLARIS_PORT_POLL_WRITE = POLLOUT;
static const int SOLARIS_PORT_POLL_READ_WRITE = POLLIN & POLLOUT;
