RFR: 7903284: jextract should infer platform specific include path for Mac OS

Mon Sep 5 16:45:20 UTC 2022

Using xcrun --show-sdk-path to find the SDK installation path

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Commit messages:
 - 7903284: jextract should infer platform specific include path for Mac OS

Changes: https://git.openjdk.org/jextract/pull/69/files
 Webrev: https://webrevs.openjdk.org/?repo=jextract&pr=69&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903284
  Stats: 29 lines in 1 file changed: 29 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jextract/pull/69.diff
  Fetch: git fetch https://git.openjdk.org/jextract pull/69/head:pull/69

PR: https://git.openjdk.org/jextract/pull/69