When writing a build.rs to run some commands you naturally want to see the output of these commands.
This is however impossible because build.rs cannot display stdout or stderr.
The next best option is to display the output when the command goes wrong for any reason.
The simple_command function does exactly that, panicking if anything at all goes wrong and
displaying the combined stderr and stdout.
Possible reasons for panicking include:
- No command specified
- Command does not exist
- Non-zero return value
DO NOT use this function in your actual application, you should be properly handling error cases!