[foreign-jextract] RFR: 8240853: Declaration.union() method sets wrong kind for the declaration object created

[Athijegannathan Sundararajan]

Fixing the Kind enum value

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Commit messages:
 - 8240853: Declaration.union() method sets wrong kind for the declaration object created

Changes: https://git.openjdk.java.net/panama-foreign/pull/43/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/43/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8240853
  Stats: 91 lines in 5 files changed: 81 ins; 0 del; 10 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/43.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/43/head:pull/43

PR: https://git.openjdk.java.net/panama-foreign/pull/43