RFR: making jextract to work with foreign-memaccess+abi branch of panama-foreign [v2]

[Athijegannathan Sundararajan]

> making jextract to work with foreign-memaccess+abi branch of panama-foreign

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

  fixed README.md to mention about jdk20_home var name and panama-foreign jdk build requirement.

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Changes:
  - all: https://git.openjdk.org/jextract/pull/59/files
  - new: https://git.openjdk.org/jextract/pull/59/files/32b7cec3..69e8f079

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jextract&pr=59&range=01
 - incr: https://webrevs.openjdk.org/?repo=jextract&pr=59&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jextract/pull/59.diff
  Fetch: git fetch https://git.openjdk.org/jextract pull/59/head:pull/59

PR: https://git.openjdk.org/jextract/pull/59