Since https://git.gnome.org/browse/brasero/commit/?id=8292eede24778531f57ecd8a8ce13ef4f5f7f2e2 Brasero doesn't use GConf2, but its spec file still lists it as a BuildRequires and Requires(pre|post|preun).
Thanks, fixed in http://pkgs.fedoraproject.org/cgit/brasero.git/commit/?id=a463acb4635a4f2a55fd4293753e03c52a1425e3