OSError errorCode is always 0

[hyu1996]

Looks like a bug.

nim-#devel/lib/pure/osproc.nim:1123, It works properly after being modified to 
the following. code
    
    
    var error: cint
    let sizeRead = read(data.pErrorPipe[readIdx], addr error, sizeof(error))
    if sizeRead == sizeof(error):
      raiseOSError(OSErrorCode(error),  # <------------- this line
                    "Could not find command: '" & $data.sysCommand & "'. OS 
error: " & $strerror(error))
    
    return pid
    
    
    Run