libxl: drop support for Xen < 4.6
Currently the libxl driver claims support for Xen >= 4.4, but Xen 4.4 and 4.5 are no longer supported upstream. Let's increase the minimum supported Xen version to 4.6 and change the defined LIBXL_API_VERSION to 0x040500, which is the API version defined when Xen 4.6 was released. Since Xen 4.6 contains a pkgconfig file, drop the now unused code that falls back to using LIBVIRT_CHECK_LIB in the absence of pkgconfig file. In addition, bumping the LIBXL_API_VERSION required adjusting the calls to libxl_set_vcpuaffinity to account for the extra parameter in the 0x040500 version of the API. Signed-off-by: NJim Fehlig <jfehlig@suse.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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