[foreign-jextract] RFR: 8258605: regression: jextract can not handle function prototypes as function arguments

[Athijegannathan Sundararajan]

Old fix is not applicable in the new code. But test brought and modified.

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Commit messages:
 - 8258605: regression: jextract can not handle function prototypes as function arguments

Changes: https://git.openjdk.java.net/panama-foreign/pull/424/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=424&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258605
  Stats: 180 lines in 5 files changed: 179 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/424.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/424/head:pull/424

PR: https://git.openjdk.java.net/panama-foreign/pull/424