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Since seabios-dir is cloned during build we need to check that it exists before recursing into it for clean, following the pattern used for qemu-*-dir etc. Also remove usage of "buildmakevars2shellvars" except when used to poopulate the environment for qemu-xen-traditional's xen-setup script, which is the only user. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>