fdManager uses poll() on Windows and RTEMS too

RTEMS needs to use the "new" network stack
Windows has poll since Vista
Don't use poll on cygwin: it emulates poll() using select().

modules/libcom/src/fdmgr/fdManager.cpp

@@ -19,28 +19,33 @@
 // 1) This library is not thread safe
 //
 
-#include <algorithm>
-
 #define instantiateRecourceLib
 #include "epicsAssert.h"
 #include "epicsThread.h"
 #include "fdManager.h"
 #include "locationException.h"
 
-using std :: max;
-
-fdManager fileDescriptorManager;
-
-static const unsigned mSecPerSec = 1000u;
-static const unsigned uSecPerSec = 1000u * mSecPerSec;
-
 #ifdef FDMGR_USE_POLL
+#ifdef _WIN32
+#define poll WSAPoll
+#endif
+
 static const int PollEvents[] = { // must match fdRegType 
     POLLRDNORM | POLLRDBAND | POLLIN | POLLHUP | POLLERR,
     POLLWRBAND | POLLWRNORM | POLLOUT | POLLERR,
     POLLPRI};
 #endif
 
+#ifdef FDMGR_USE_SELECT
+#include <algorithm>
+using std :: max;
+#endif
+
+fdManager fileDescriptorManager;
+
+static const unsigned mSecPerSec = 1000u;
+static const unsigned uSecPerSec = 1000u * mSecPerSec;
+
 //
 // fdManager::fdManager()
 //