Attribute stuff to libsh

Just a cosmetic change...
Strip LGPLv2.1 text off finished libdl.sh.conf

Why bloat an installed configuration file with license information?
Regardless of its license, you edit it to suit your tastes anyway.
Fix typo in libdl.sh

Oops! The demand-loading library distributed with releases 0.1 and 0.1.1
actually never worked because it invoked `libdl path' instead of
`libdl-sh path'. Let's fix that!

Closes: #11