RFR: Revert "7903198: Refine filtering for enums"

[Athijegannathan Sundararajan]

This reverts commit c2f1359c46728e3787bf0b0316c8078edd63ff7b.

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Commit messages:
 - Revert "7903198: Refine filtering for enums"

Changes: https://git.openjdk.org/jextract/pull/50/files
 Webrev: https://webrevs.openjdk.org/?repo=jextract&pr=50&range=00
  Stats: 46 lines in 6 files changed: 4 ins; 24 del; 18 mod
  Patch: https://git.openjdk.org/jextract/pull/50.diff
  Fetch: git fetch https://git.openjdk.org/jextract pull/50/head:pull/50

PR: https://git.openjdk.org/jextract/pull/50