RFR: Remove dead code [v2]

[Jorn Vernee]

> Remove the last little bits of dead code. As found through code coverage report.

Jorn Vernee has updated the pull request incrementally with two additional commits since the last revision:

 - last few bits
 - remove more dead code

-------------

Changes:
  - all: https://git.openjdk.org/jextract/pull/158/files
  - new: https://git.openjdk.org/jextract/pull/158/files/5f87836b..a3383648

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jextract&pr=158&range=01
 - incr: https://webrevs.openjdk.org/?repo=jextract&pr=158&range=00-01

  Stats: 22 lines in 1 file changed: 0 ins; 22 del; 0 mod
  Patch: https://git.openjdk.org/jextract/pull/158.diff
  Fetch: git fetch https://git.openjdk.org/jextract.git pull/158/head:pull/158

PR: https://git.openjdk.org/jextract/pull/158