message: Allow .build_command() to set Execs to ran
diff: @@ -715,7 +715,8 @@ impl Execs {
  p.exec_with_output()
  }
  - pub fn build_command(&self) -> Command {
  + pub fn build_command(&mut self) -> Command {
  + self.ran = true;
  // TODO avoid unwrap
  let p = (&self.process_builder).clone().unwrap();
  p.build_command()
  