Stderr is unconditionally redirected

Description

Contents of stderr will always be sliently redirected and consumed.

Reproduction

cargo build outputs are printed to stderr, so we can use it as a demo:

run_cmd!(cargo build).unwrap();

Run it and nothing happens.

The Cause

In bd7837f, an attempt to fix logging for stderr:

rust_cmd_lib/src/process.rs

Lines 464 to 467 in f125db8

    
           // set up error pipe 
        
           let (pipe_reader, pipe_writer) = os_pipe::pipe()?; 
        
           self.stderr_redirect = Some(CmdOut::Pipe(pipe_writer)); 
        
           self.stderr_logging = Some(pipe_reader);

It is intentional. You need to set up a logger to show it. See readme.

	// set up error pipe
	let (pipe_reader, pipe_writer) = os_pipe::pipe()?;
	self.stderr_redirect = Some(CmdOut::Pipe(pipe_writer));
	self.stderr_logging = Some(pipe_reader);