Auto merge of #113061 - Amanieu:x86_64-ohos, r=compiler-errors

Add x86_64-unknown-linux-ohos target

This complements the existing `aarch64-unknown-linux-ohos` and `armv7-unknown-linux-ohos` targets.

This should be covered by the existing MCP (rust-lang/compiler-team#568), but I can also create a new MCP if that is preferred.