[release/6.0] Add s390x support in a few places in eng/native build scripts #58366
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Backport of #56426 to release/6.0
/cc @akoeplinger @uweigand
Customer Impact
Make isMSBuildOnNETCoreSupported return true on s390x, this fixes generating version headers when building on s390x.
Adds s390x platform-specific library name in find_unwind_libs, this enables linking against system-provided libunwind on s390x.
Testing
Manual testing.
Risk
Very low, we don't build s390x in our official builds.