bind: cosmetic fix for Emacs' syntax highlighting

pkgs/servers/dns/bind/default.nix

···
     moveToOutput bin/bind9-config $dev
     moveToOutput bin/isc-config.sh $dev
 
-    for f in $out/lib/*.la; do
+    for f in "$out/lib/"*.la; do
       sed -i $f -e 's|-L${openssl.dev}|-L${openssl.out}|g'
     done
   '';