MAISTRA-2648: WASM fix for s390x [maistra-2.2]

[knm3000]

Fixes https://issues.redhat.com/browse/MAISTRA-2648
The permanent fix is not a part of maistra/envoy yet:
proxy-wasm/proxy-wasm-cpp-host#198

Signed-off-by: Konstantin Maksimov konstantin.maksimov@ibm.com

[maistra-bot]

Hi @knm3000. Thanks for your PR.

I'm waiting for a maistra member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[oschaaf]

LGTM, but deferring to @twghu and @jwendell for final review to avoid collisions with any in-flight work they might have. Therefore I added the do-not-merge/hold label to avoid auto-merge upon this approval.

[twghu]

This fix stops an existing test failing on s390x https://github.com/maistra/header-append-filter/blob/maistra-2.2/tests/run-envoy.sh#L34