drop --with-xft for gtk3 toolkit build
    
    It should be deprecated now by Cairo rendering with the new native pgtk in 28
    
    See current build.log
    eg https://koji.fedoraproject.org/koji/buildinfo?buildID=2001145:
    
      Does Emacs use cairo?                                   yes
    :
      Does Emacs use -lfreetype?                              yes
      Does Emacs use HarfBuzz?                                yes
      Does Emacs use -lm17n-flt?                              yes
      Does Emacs use -lotf?                                   yes
      Does Emacs use -lxft?                                   no