evince: enable postscript support

+1
+1
pkgs/desktops/gnome-3/core/evince/default.nix
··· 34 34 35 35 configureFlags = [ 36 36 "--disable-nautilus" # Do not build nautilus plugin 37 + "--enable-ps" 37 38 "--enable-introspection" 38 39 (if supportXPS then "--enable-xps" else "--disable-xps") 39 40 ];