RFR: JDK-8311938: Add default cups include location for configure on AIX

[Andreas Steiner]

Add the default include location(/opt/freeware/include/) for cups on AIX. With this set the additional configure parameter --with-cups-include can be removed, which was needed on AIX.

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Commit messages:
 - JDK-8311938: Add default cups include location for configure on AIX

Changes: https://git.openjdk.org/jdk/pull/15100/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15100&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311938
  Stats: 9 lines in 1 file changed: 9 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15100.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15100/head:pull/15100

PR: https://git.openjdk.org/jdk/pull/15100