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hvmloader is unhosted, and shouldn't use the system errno.h. It already has to use Xen's errno.h for other hypercalls. The use of public/io/xs_wire.h requires the use of un-prefixed errno values. This fixes the build on stricter toolchains where requesting -fno-builtin does reduce the include path as much as it can. Reported-by: Doug Goldstein <cardoe@cardoe.com> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Doug Goldstein <cardoe@cardoe.com> Reviewed-by: Wei Liu <wei.liu2@citrix.com> Acked-by: Jan Beulich <jbeulich@suse.com>