Remove now unneeded buffer workaround for legacy PHP < 5.4

Author: clue

src/Process.php

@@ -130,13 +130,6 @@ public function start(LoopInterface $loop, $interval = 0.1)
         $this->stdout->on('close', $streamCloseHandler);
         $this->stderr = new ReadableResourceStream($this->pipes[2], $loop);
         $this->stderr->on('close', $streamCloseHandler);
-
-        // legacy PHP < 5.4 SEGFAULTs for unbuffered, non-blocking reads
-        // work around by enabling read buffer again
-        if (PHP_VERSION_ID < 50400) {
-            stream_set_read_buffer($this->pipes[1], 1);
-            stream_set_read_buffer($this->pipes[2], 1);
-        }
     }
 
     /**