Update lshell to 0.9.12.

pkgsrc changes:
- Add license

Upstream changes:
=== v0.9.12 04/05/2010 ===
* A minor bug was inserted in version 0.9.11 with the sudo command.
It has been corrected in this version.

=== v0.9.11 27/04/2010 ===
* Corrects traceback when executing a command that had a python homonym
(e.g. "print foo" or "set"). (Closes: SF#2969631)
* Corrected completion error when using "~/". Thanks to Piotr Minkina for
reporting this.
* Corrected the get_aliases function.
* Corrected interpretation of ~user. Thank you Adrien Urban for reporting
this.
* The 'home_path' variable is being deprecated from this version and on.
Please use your system's tools to set a user's home directory.
It will be completely removed in the next version of lshell.
* Corrected shell variable and wildcards expansions when checking a command.
Thank you Adrien Urban for reporting this.
* Added possibility to allow/forbid scp upload/download using scp_upload
and scp_download variables.
* Corrected bug when using the "command=" in openSSH's authorized_keys.
lshell now takes into account the SSH_ORIGINAL_COMMAND environment
variable. Thank you Jason Heiss for reporting this.
* Corrected traceback when aliases is not defined in configuration, and
command is sent over SSH. Thank you Jason Heiss for reporting this.

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