RFR: 8320053: GHA: Cross-compile gtest code [v2]

[Aleksey Shipilev]

> Looking at why GHA did not catch [JDK-8320050](https://bugs.openjdk.org/browse/JDK-8320050), even though it builds hotspot, I realized we do not configure the build with gtest, which means we skip the build checks for gtest VM. It would be useful to cross-compile with all tests enabled, even without running them.
> 
> (This would probably make sense to do for JDK native code, but AFAICS it would require defining a few new make targets).
> 
> Additional testing:
>  - [ ] GHA

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Also get gtest

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/16652/files
  - new: https://git.openjdk.org/jdk/pull/16652/files/ca7c5c9f..eb26ddcd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16652&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16652&range=00-01

  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/16652.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16652/head:pull/16652

PR: https://git.openjdk.org/jdk/pull/16652