RFR: 7903200: sync makefiles to build jmod for jextract

[Athijegannathan Sundararajan]

sync makefiles for jmod creation (and update for jdk19). renamed jmod file name

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Commit messages:
 - 7903200: sync makefiles to build jmod for jextract

Changes: https://git.openjdk.java.net/jextract/pull/39/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jextract&pr=39&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7903200
  Stats: 34 lines in 2 files changed: 16 ins; 10 del; 8 mod
  Patch: https://git.openjdk.java.net/jextract/pull/39.diff
  Fetch: git fetch https://git.openjdk.java.net/jextract pull/39/head:pull/39

PR: https://git.openjdk.java.net/jextract/pull/39