[jdk11u-dev] RFR: 8304867: Explicitly disable dtrace for ppc builds

[Matthias Baesken]

Backport of 8304867

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Commit messages:
 - Backport ff368d504e9101e11c7182185f56255f429d31e3

Changes: https://git.openjdk.org/jdk11u-dev/pull/2017/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2017&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304867
  Stats: 6 lines in 1 file changed: 3 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2017.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2017/head:pull/2017

PR: https://git.openjdk.org/jdk11u-dev/pull/2017