I added the option --no-backup-if-mismatch to _default_patch_flags in /usr/lib/macros in rawhide (rpm-4.13.0-0.rc1.31.fc25). If you need another behavior of the %patch spec file directive then you can redefine the macro _default_patch_flags with desired flags in your spec file.
This change was required in this bug #884755. You can see the bug for other details. Lubos -- devel mailing list devel@lists.fedoraproject.org http://lists.fedoraproject.org/admin/lists/devel@lists.fedoraproject.org
