RFR: updating libclang binding for jextract changes and llvm 13.0.0

[Athijegannathan Sundararajan]

backport of same change from jdk19 master branch

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Commit messages:
 - updating libclang binding for jextract changes and llvm 13.0.0

Changes: https://git.openjdk.org/jextract/pull/53/files
 Webrev: https://webrevs.openjdk.org/?repo=jextract&pr=53&range=00
  Stats: 245 lines in 22 files changed: 6 ins; 7 del; 232 mod
  Patch: https://git.openjdk.org/jextract/pull/53.diff
  Fetch: git fetch https://git.openjdk.org/jextract pull/53/head:pull/53

PR: https://git.openjdk.org/jextract/pull/53