evolution-data-server is using %{?_isa} in BuildRequires which is prohibited by Packaging Guidelines: https://fedoraproject.org/wiki/Packaging:Guidelines#BuildRequires_and_.25.7B_isa.7D. Please fix it ASAP.
Thanks for a bug report. It's not used in Fedora at the moment, that part is skipped there. It had been added with commit 8ea917809fccd2dc9fe8a23e77619a9342d01d0d back on 2012-02-20, unfortunately without any explanation. Fixed with commit 85d2857 for the master branch.