[Build script] Fix debug messages

[Devjiu]

Remove debug messages. There are still possible misuse of script as options without "-" in the start will be ignored.

[leshikus]

Not using -e is a bad practice; moreover, -e should be set at the script start with set -e

I don't like removing it

If you have a command cmd, which could potentially fail, and you want to handle that, use if cmd or cmd ||

[Devjiu]

Not using -e is a bad practice; moreover, -e should be set at the script start with set -e

I don't like removing it

If you have a command cmd, which could potentially fail, and you want to handle that, use if cmd or cmd ||

I've reworked this part based on Andrey's comments, now the options parser is a little simpler and I've removed the bash syntax since it's not needed yet.

[leshikus]

Looks good, thank you!