[foreign-jextract] RFR: Fix foreign-jextract after latest library lookup changes

[Maurizio Cimadamore]

This is a simple patch which fixes up the calls to LibraryLookup so that the heading `MethodHandles.Lookup` parameter
is dropped.

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Commit messages:
 - Merge foreign-jextract with latest library lookup changes

Changes: https://git.openjdk.java.net/panama-foreign/pull/139/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/139/webrev.00
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/139.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/139/head:pull/139

PR: https://git.openjdk.java.net/panama-foreign/pull/139