RFR: samples fixes for JDK 21 panama API changes and version change. [v2]

[Athijegannathan Sundararajan]

> All samples fine on MacOS. I changed run_windows scripts but I've not tested samples on Windows.

Athijegannathan Sundararajan has updated the pull request incrementally with two additional commits since the last revision:

 - Merge pull request #4 from JornVernee/Win_Scripts
   
   fix teapot
 - fix teapot

-------------

Changes:
  - all: https://git.openjdk.org/jextract/pull/126/files
  - new: https://git.openjdk.org/jextract/pull/126/files/89cd81b0..533f8ce2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jextract&pr=126&range=01
 - incr: https://webrevs.openjdk.org/?repo=jextract&pr=126&range=00-01

  Stats: 8 lines in 1 file changed: 0 ins; 1 del; 7 mod
  Patch: https://git.openjdk.org/jextract/pull/126.diff
  Fetch: git fetch https://git.openjdk.org/jextract.git pull/126/head:pull/126

PR: https://git.openjdk.org/jextract/pull/126