[foreign-jextract] RFR: 8264825: update libclang bindings after recent jextract changes [v2]

[Athijegannathan Sundararajan]

> * Fixed redundant cast generation (which leads to build warnings after libclang is regenerated)
> * libclang binding regenerated and calling code adjusted.
> * All tests and samples pass

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

  using implicit scope as suggested in code review

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

Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/491/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/491/files/62f6c1d8..86cecc5a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=491&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=491&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/491.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/491/head:pull/491

PR: https://git.openjdk.java.net/panama-foreign/pull/491