[foreign-abi] Integrated: Fix implicit default constructor linting warnings

[Athijegannathan Sundararajan]

On Mon, 24 Aug 2020 13:04:35 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> Hi,
> 
> This PR fixes some newly added linter warnings about implicit private constructor generation:
> 
> - Add private constructor to CSupport
> - Make NativeScope and interface
> 
> wrt NativeScope; it had no fields, so it could be made an interface. I could also have added a `protected` empty
> constructor, but making it an interface seemed cleaner (WDYT?)
> Thanks,
> Jorn

Marked as reviewed by sundar (Committer).

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PR: https://git.openjdk.java.net/panama-foreign/pull/289