[foreign-jextract] RFR: 8260344: jextract crashes with exception for log.h from libdebian-installer4-dev

[Athijegannathan Sundararajan]

Fixed type handling in createFunction when typedef on function pointer is used.

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Commit messages:
 - 8260344: jextract crashes with exception for log.h from libdebian-installer4-dev

Changes: https://git.openjdk.java.net/panama-foreign/pull/439/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=439&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260344
  Stats: 94 lines in 3 files changed: 93 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/439.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/439/head:pull/439

PR: https://git.openjdk.java.net/panama-foreign/pull/439