RFR: 8345155: Add /native to native test in FFM

[Per Minborg]

On Wed, 5 Feb 2025 08:59:10 GMT, SendaoYan <syan at openjdk.org> wrote:

> Hi all,
> 
> This PR add `/native` keyword in the test header for FFM tests. The `/native` keyword will make run the related tests by jtreg standalone more friendly.
> 
> I runed all the FFM tests without `-nativepath` argument and find the fail tests. This will find all the FFM tests which missing '/native' flag.
> 
> Change has been verified locally, test-fix, no risk.

Thanks for fixing this issue!

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Marked as reviewed by pminborg (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23458#pullrequestreview-2595847242