[jdk17u] RFR: 8273606: Zero: SPARC64 build fails with si_band type mismatch

[Aleksey Shipilev]

On Fri, 1 Oct 2021 11:57:01 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Fixes the corner case in Zero/SPARC64 build. The change is no-op for the well-behaved libc.
> 
> Additional testing:
>  - [x] Linux Zero/SPARC64 cross-compilation fails without the patch, passes with the patch

Got the push approval.

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PR: https://git.openjdk.java.net/jdk17u/pull/138