[virt] fix build with libxml 2.14
libxml2 removed ATTRIBUTE_UNUSED defination since 2.14:
https://gitlab.gnome.org/GNOME/libxml2/-/commit/208f27f9641a59863ce1f7d4992df77f7eb0ea9d
[virt] fix build with libxml 2.14 Tags None Referenced Files None Subscribers None
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