ephemeral port fixups for win32

src/os-win32.c

@@ -346,7 +346,7 @@ int os_opensocket(unsigned short port) {
         (listen(sock, MAXBACKLOG) == -1)) {
         error = errno;
         while ((closesocket(sock) == SOCKET_ERROR) && (WSAGetLastError() == WSAEINTR)); 
-        errno = EINVAL; /* should be addrinuse or somethign */
+        errno = WSAGetLastError();
         return -1;
     }
 

src/win32.h

@@ -85,6 +85,7 @@
 #define MAX_NAME_LEN _MAX_PATH
 #define ETIME 101
 #define PATH_MAX 512 /* it's clearly not _MAX_PATH... other projects seem to use 512 */
+#define EADDRINUSE WSAEADDRINUSE
 
 #define HOST "unknown-windows-ick"
 #define SERVICENAME "Firefly Media Server"