Alias newer "--library" to "--load-phutil-library" in legacy workflows
Alias newer "--library" to "--load-phutil-library" in legacy workflows

Summary: See PHI1772. This is a quick patch to make some debugging/testing tasks easier until remaining workflows modernize. See T13490.

Test Plan: Ran `scripts/arcanist.php --library ...`, got the same behavior as `scripts/arcanist.php --load-phutil-library ...`.

Differential Revision: https://secure.phabricator.com/D21323

Khan/arcanist,codelabs-ch/arcanist,phacility/arcanist,Khan/arcanist,phacility/arcanist,codelabs-ch/arcanist,codelabs-ch/arcanist,Khan/arcanist,phacility/arcanist,Khan/arcanist,phacility/arcanist,codelabs-ch/arcanist,phacility/arcanist,codelabs-ch/arcanist