RFR: JDK-8311938: Add default cups include location for configure on AIX [v4]

[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.

Andreas Steiner has updated the pull request incrementally with one additional commit since the last revision:

  use AC_CHECK_HEADERS for AIX default location too

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15100/files
  - new: https://git.openjdk.org/jdk/pull/15100/files/955f3025..c8575b14

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15100&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15100&range=02-03

  Stats: 5 lines in 1 file changed: 0 ins; 0 del; 5 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