Make bash completion files non-executable
    
    	* bash-completion/abicompat: Make this be non-executable.
    	* bash-completion/abidiff: Likewise.
    	* bash-completion/abidw: Likewise.
    	* bash-completion/abilint: Likewise.
    	* bash-completion/abinilint: Likewise.
    	* bash-completion/abipkgdiff: Likewise.
    	* bash-completion/abisym: Likewise.
    	* bash-completion/fedabipkgdiff: Likewise.
    
    Signed-off-by: Dodji Seketeli <dodji@redhat.com>