RFR: 8238556: jextract command line option cleanup

[Athijegannathan Sundararajan]

8238556: jextract command line option cleanup

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Commits:
 - 59731b9a: 8238556: jextract command line option cleanup

Changes: https://git.openjdk.java.net/panama-foreign/pull/7/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/7/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8238556
  Stats: 85 lines in 9 files changed: 0 ins; 45 del; 40 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/7.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/7/head:pull/7

PR: https://git.openjdk.java.net/panama-foreign/pull/7