RFR: backporting fix for 7903547: libffmpeg sample crashes JVM

[Maurizio Cimadamore]

On Tue, 26 Sep 2023 10:50:27 GMT, Athijegannathan Sundararajan <sundar at openjdk.org> wrote:

> backporting fix for 7903547: libffmpeg sample crashes JVM from 'panama' branch

Marked as reviewed by mcimadamore (Committer).

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PR Review: https://git.openjdk.org/jextract/pull/129#pullrequestreview-1643984006