Annotate xfixes version requirement in the spec
    
    When rebuilding updated GNOME packages for CentOS Stream 9, this error
    is shown:
    
    ```
    Dependency xfixes found: NO found 5.0.3 but need: '>= 6.0'
    Did not find CMake 'cmake'
    Found CMake: NO
    Run-time dependency xfixes found: NO
    
    meson.build:111:13: ERROR: Dependency lookup for xfixes with method 'pkgconfig' failed: Invalid version, need 'xfixes' ['>= 6.0'] found '5.0.3'.
    ```
    
    https://copr.fedorainfracloud.org/coprs/g/centoshyperscale/gnome/build/7394329/
    
    Signed-off-by: Michel Lind <salimma@fedoraproject.org>