build: improve hvisor-tool cross-build compatibility and ivc kernel A… - #85
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…PI support Keep tools compiler selection flexible: only fall back to CROSS_COMPILE gcc when CC is the default from make, so explicit CC overrides still work. Add a local virtio mmio UAPI compatibility header for environments where the cross sysroot lacks linux virtio_mmio definitions. Make demo binaries optional via BUILD_DEMOS (default off), so the main userspace hvisor binary is not blocked by optional rpmsg demo headers. Update ivc driver to include linux version checks and use the newer class_create API on Linux 6.4+, while keeping backward-compatible behavior for older kernels.
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OpenHarmony use LLVM instead of CC. And its sysroot lacks virtio_mmio definitions. And its Linux Kernel version is 6.6. So this pr: