d0191b8 use %bash_completions_dir

Authored and Committed by tmz 2 years ago
    use %bash_completions_dir
    
    A %bash_completions_dir macros was added to redhat-rpm-config recently¹.
    It is available for all supported Fedora releases.  Define it if
    missing, to support EL <= 9.
    
    This is likely to become part of the packaging guideline soon².
    
    ¹ https://src.fedoraproject.org/rpms/redhat-rpm-config/c/483a3b (Add
      macros.shell-completions, 2022-06-25)
    ² https://pagure.io/packaging-committee/issue/1202
    
        
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