[foreign-jextract] RFR: 8266682: sync jextract for LibraryLookup removal [v3]

[Athijegannathan Sundararajan]

> Using System.load/.loadLibrary in generated code and jextract code. Class initialisation dummy method to take sure constants classes initialise header-class before looking up names.

Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last revision:

  simplified loadLibrary generation

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/529/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/529/files/49a432dc..7bc40d67

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=529&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=529&range=01-02

  Stats: 11 lines in 2 files changed: 0 ins; 4 del; 7 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/529.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/529/head:pull/529

PR: https://git.openjdk.java.net/panama-foreign/pull/529