Complete(?) migration to net_strerror/net_errno

for nicer Win32 error messages

src/network/httpd.c

@@ -2416,11 +2416,7 @@ static void httpd_HostThread( httpd_host_t *host )
 
         if( (i_ret == -1) && (errno != EINTR) )
         {
-#if defined(WIN32) || defined(UNDER_CE)
-            msg_Warn( host, "cannot select sockets (%d)", WSAGetLastError( ) );
-#else
-            msg_Warn( host, "cannot select sockets : %s", strerror( errno ) );
-#endif
+            msg_Warn( host, "select error: %s", net_strerror( net_errno ) );
             msleep( 1000 );
             continue;
         }

src/network/io.c

@@ -365,11 +365,7 @@ int __net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
 
         if( i_ret < 0 )
         {
-#if defined(WIN32) || defined(UNDER_CE)
-            msg_Err( p_this, "network selection error (%d)", WSAGetLastError() );
-#else
-            msg_Err( p_this, "network selection error (%s)", strerror(errno) );
-#endif
+            msg_Err( p_this, "network error: %s", net_strerror(net_errno) );
             return i_total > 0 ? i_total : -1;
         }