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Search existing value of XEN_HEADERS for Xen headers
This allows a caller to specify a specific location for the Xen headers. For example, from a version of Xen just built in a neighbouring directory. (Without this it is not possible to build against a specific Xen without being able to overwrite system header areas.) If XEN_HEADERS is unset, or not suitable, use the existing search strategy. Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>