[foreign-jextract] RFR: 8243485: adjust panama_jextract.md samples after recent foreign-abi changes

[Henry Jen]

On Thu, 23 Apr 2020 12:49:39 GMT, Athijegannathan Sundararajan <sundar at openjdk.org> wrote:

> removed references to Foreign class. Changed system property in scripts.

Looks good to me

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Marked as reviewed by henryjen (Committer).

PR: https://git.openjdk.java.net/panama-foreign/pull/130