New comment by 2asoft on void-packages repository

https://github.com/void-linux/void-packages/pull/20384#issuecomment-605390165

Comment:
I updated to edit the launcher scripts with the first script line being
`XXX_JDK=${XXX_JDK:-${IDEA_JDK}}`

This way user customizations, if any, are kept, and each IDE defaults to using `IDEA_JDK` if it is present.
I've verified locally that this works well.

I opted to do this instead of shipping a profile script with each IDE because I find this cleaner.