[foreign-jextract] RFR: Samples update after 8249879. Added opengl sample

[Athijegannathan Sundararajan]

.segment/.address calls removed. added opengl sample

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Commit messages:
 - Samples update after 8249879. Added opengl sample

Changes: https://git.openjdk.java.net/panama-foreign/pull/268/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/268/webrev.00
  Stats: 294 lines in 2 files changed: 165 ins; 8 del; 121 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/268.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/268/head:pull/268

PR: https://git.openjdk.java.net/panama-foreign/pull/268