[foreign-jextract] RFR: 8249300: jextract does not handle empty parameter list of a function pointer parameters

[Athijegannathan Sundararajan]

Array type parameter in function callback is handled properly

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

Commit messages:
 - 8249300: jextract does not handle empty parameter list of a function pointer parameters

Changes: https://git.openjdk.java.net/panama-foreign/pull/244/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/244/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8249300
  Stats: 106 lines in 3 files changed: 103 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/244.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/244/head:pull/244

PR: https://git.openjdk.java.net/panama-foreign/pull/244