remove unused

src/lib/ebus/device.cpp

@@ -896,18 +896,6 @@ void SerialDevice::checkDevice() {
   }
 }
 
-#ifdef __CYGWIN__
-  #ifndef TCP_KEEPCNT
-    #define TCP_KEEPCNT 8
-  #endif
-  #ifndef TCP_KEEPINTVL
-    #define TCP_KEEPINTVL 150
-  #endif
-  #ifndef TCP_KEEPIDLE
-    #define TCP_KEEPIDLE 14400
-  #endif
-#endif
-
 result_t NetworkDevice::open() {
   result_t result = Device::open();
   if (result != RESULT_OK) {