Stop monitoring fds after receiving EOF

When a subprocess closes its stdout/stderr pipe, that causes
pselect to always indicate that fd is readable, and read to
always return with EOF on that fd.  Therefore when we receive an
EOF we need to stop monitoring the fd.  Otherwise Emacs will
spin at 100% CPU, repeatedly reading that same EOF off the fd.

* src/process.c (wait_reading_process_output): When
'read_process_output' returns EOF indication, stop monitoring
the descriptor.  (Bug#79436)

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