[FR]: Add z/OS platform for death test support

[abhina-sree]

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Does the feature exist in the most recent commit?

No

Why do we need this feature?

We would like to support death tests on z/OS as well

Describe the proposal.

Add GTEST_OS_ZOS here https://github.com/google/googletest/blob/main/googletest/include/gtest/internal/gtest-port.h#L672

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

z/OS system

[abhina-sree]

PR to fix this https://github.com/google/googletest/pull/4527

[derekmauro]

PR was merged.