[foreign-jextract] RFR: 8258605: regression: jextract can not handle function prototypes as function arguments [v2]

[Athijegannathan Sundararajan]

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

Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last revision:

  simplified getAsFunctionPointer as per code review.

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/424/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/424/files/93a2438b..e0da5711

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=424&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=424&range=00-01

  Stats: 11 lines in 2 files changed: 0 ins; 8 del; 3 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