configre: properly check for libtoolize

Fix a copy-n-paste typo, where the libtoolize check
would re-run the libtool check.

Signed-off-by: Johannes Stezenbach <js@sig21.net>

 #!/bin/sh

 call_to=@@DEFAULT_LD@@

 case "${CTNG_LD_IS}" in

     bfd)    call_to=bfd;;

     gold)   call_to=gold;;

 esac

 exec "${0}.${call_to}" "$@"

 exit $?