Dawid Dziurla c8c2e38bcb
Consistently use HOMEBREW_RUBY_WARNINGS when calling ruby
Adding this in `dev-cmd/ruby.rb` allows us to suppress warnings like:
```
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/language/python.rb:8: warning: Insecure world writable dir /home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/shims/scm in PATH, mode 040777
```
2020-08-20 14:59:58 +02:00
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