[FR]: Add support for VxWorks 7

Does the feature exist in the most recent commit?

There was a commit that added VxWorks compatibility https://github.com/google/googletest/pull/990/changes but this was over 10 years ago and the code no longer exists or was not maintained. The latest version of Google Test doesn't build on VxWorks 22.09.

Why do we need this feature?

VxWorks is still used in industries like aerospace and automotive where a real-time OS is required. These products are still unit tested and it would be valuable to run said unit tests on hardware.

Describe the proposal.

• Verify that the latest stable of release of VxWorks can compile the latest version of VxWorks (Vxworks 7 25.09) as either a DKM or an RTP

Is the feature specific to an operating system, compiler, or build system version?

Yes, VxWorks specifically. VxWorks 7 25.09 is the current stable version