bug#29454: wait_reading_process_output duplication

[Charles A. Roelli]

Looks like these two blocks are duplicated in
wait_reading_process_output in process.c:

5628 #ifdef WINDOWSNT
5629          /* FIXME: Is this special case still needed?  */
5630          /* Note that we cannot distinguish between no input
5631             available now and a closed pipe.
5632             With luck, a closed pipe will be accompanied by
5633             subprocess termination and SIGCHLD.  */
5634          else if (nread == 0 && !NETCONN_P (proc) && !SERIALCONN_P (proc)
5635                   && !PIPECONN_P (proc))
5636            ;
5637 #endif

5664          /* If we can detect process termination, don't consider the
5665             process gone just because its pipe is closed.  */
5666          else if (nread == 0 && !NETCONN_P (proc) && !SERIALCONN_P (proc)
5667                   && !PIPECONN_P (proc))
5668            ;

Can the first be deleted?