Add protoc binaries for Z and P

[vimalk78]

This PR adds missing s390x and ppcle64 binaries of protoc, required for building vector on respective architectures.

These binaries are copied from https://github.com/protocolbuffers/protobuf/releases/tag/v3.15.8

A PR to update upstream is also sent. danburkert/prost#1

[openshift-ci]

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[vimalk78]

/cc @jcantrill

[openshift-ci]

@vimalk78: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/unit	fee4905	link	true	/test unit

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[vimalk78]

forcefully merging this, as needed for Z and P architectures