[jdk15u-dev] RFR: 8252401: Introduce Utils.TEST_NATIVE_PATH

[Yuri Nesterenko]

I'd like to backport this change to simplify some further tests backporting even without massive refactoring.

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Commit messages:
 - Backport e1d29cd6fb4a9d1ccf2105840e54593a6c3e5c7c

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/205/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=205&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252401
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/205.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/205/head:pull/205

PR: https://git.openjdk.java.net/jdk15u-dev/pull/205