Remove some WIN32-guarded code.

include/tins/ethernetII.h

@@ -159,14 +159,12 @@ namespace Tins {
          */
         bool matches_response(const uint8_t *ptr, uint32_t total_sz) const;
 
-        #ifndef WIN32
         /** 
          * \brief Receives a matching response for this packet.
          *
          * \sa PDU::recv_response
          */
         PDU *recv_response(PacketSender &sender, const NetworkInterface &iface);
-        #endif // WIN32
 
         /**
          * \brief Getter for the PDU's type.

include/tins/packet_sender.h

@@ -296,7 +296,7 @@ namespace Tins {
          */
         PDU *send_recv(PDU &pdu, const NetworkInterface &iface);
 
-        #ifndef WIN32
+        #if !defined(WIN32) || defined(HAVE_PACKET_SENDER_PCAP_SENDPACKET)
         /** 
          * \brief Receives a layer 2 PDU response to a previously sent PDU.
          *
@@ -331,7 +331,7 @@ namespace Tins {
          */
         void send_l2(PDU &pdu, struct sockaddr* link_addr, uint32_t len_addr, 
           const NetworkInterface &iface = NetworkInterface());
-        #endif // WIN32
+        #endif // !WIN32 || HAVE_PACKET_SENDER_PCAP_SENDPACKET
 
         /** 
          * \brief Receives a layer 3 PDU response to a previously sent PDU.