- Update Xen partial checksums patch
    - Remove perl Requires (#225691)
    - Make dhcp-devel depend on dhcp = e:v-r (#225691)
    - libdhcp4client-devel Requires pkgconfig (#225691)
    - Do not add to RPM_OPT_FLAGS, use COPTS variable instead (#225691)
    - Use %{buildroot} macro instead of RPM_BUILD_ROOT variable (#225691)
    - Preserve timestamps on all installed data files (#225691)
    - Remove dhcp-options.5.gz and dhcp-eval.5.gz symlinking in post (#225691)
    - Use %defattr(-,root,root,-) (#225691)
    - Do not flag init scripts as %config in %files section (#225691)