RFR: 8304030: Configure call fails on AIX when using --with-gtest option.

[Arno Zeller]

When calling configure with the --with-gtest option on AIX it fails with the following error:
...
checking for X11/Intrinsic.h... yes
checking for gtest... /sapmnt/sapjvm_work/openjdk/tools/gtest/googletest-1.13.0

-------------

Commit messages:
 - JDK-8304030

Changes: https://git.openjdk.org/jdk/pull/13011/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13011&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304030
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13011.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/13011/head:pull/13011

PR: https://git.openjdk.org/jdk/pull/13011