[jdk11u-dev] RFR: 8307603: [AIX] Broken build after JDK-8307301

[Tyler Steele]

Fixes this build error--associated with Harfbuzz--in jdk11.

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Commit messages:
 - Backport bb3e44d8b604b4e3facc4f49f625cc0b7ff2abd7

Changes: https://git.openjdk.org/jdk11u-dev/pull/2058/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2058&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307603
  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2058.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2058/head:pull/2058

PR: https://git.openjdk.org/jdk11u-dev/pull/2058