fix PR#2261 in a different way

crypto/bio/b_sock.c

@@ -731,7 +731,14 @@ again:
 #ifdef SO_REUSEADDR
 		err_num=get_last_socket_error();
 		if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
+#ifdef OPENSSL_SYS_WINDOWS
+			/* Some versions of Windows define EADDRINUSE to
+			 * a dummy value.
+			 */
+			(err_num == WSAEADDRINUSE))
+#else
 			(err_num == EADDRINUSE))
+#endif
 			{
 			client = server;
 			if (h == NULL || strcmp(h,"*") == 0)

e_os.h

@@ -150,10 +150,6 @@ extern "C" {
 #define clear_socket_error()	WSASetLastError(0)
 #define readsocket(s,b,n)	recv((s),(b),(n),0)
 #define writesocket(s,b,n)	send((s),(b),(n),0)
-#ifdef EADDRINUSE
-#undef EADDRINUSE
-#endif
-#define EADDRINUSE		WSAEADDRINUSE
 #elif defined(__DJGPP__)
 #define WATT32
 #define get_last_socket_error()	errno