RFR: Drop VaList test from jextract

Mon Jan 9 14:23:00 UTC 2023

Following https://git.openjdk.org/panama-foreign/pull/763, this patch removes a VaList test (which is now failing) from the jextract code.

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Commit messages:
 - Initial push

Changes: https://git.openjdk.org/jextract/pull/99/files
 Webrev: https://webrevs.openjdk.org/?repo=jextract&pr=99&range=00
  Stats: 128 lines in 3 files changed: 0 ins; 128 del; 0 mod
  Patch: https://git.openjdk.org/jextract/pull/99.diff
  Fetch: git fetch https://git.openjdk.org/jextract pull/99/head:pull/99

PR: https://git.openjdk.org/jextract/pull/99