If JIT support is built in to ruby, there's no choice other then to
leave this cc reference as is. removeReferencesToCC didn't do it's job
completely since some time ago. That's why it was practically redundant
- `lib/ruby/${version}/<platform>/rbconfig.rb` still referenced cc.
Removing this reference from
`lib/ruby/${version}/<platform>/rbconfig.rb` as well might lead to
breakage in some Gems that require this feature.
But, if JIT support is not desired, it should be safe enough to
completely remove all cc references, both in
lib/ruby/${version}/<platform>/rbconfig.rb and in $out/lib/libruby.so .
Hence now `rubyMinimal` has JIT support disabled and it has no
references at all to stdenv.cc.
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