Changed the API just a bit.
Changed the API just a bit.

 * pkg_config now uses var args
 * add_pkg(<script_name>) also uses car args but can be used for
   multiple scripts (i.e. Unix.add_pkg('sdl', 'wx'))

Signed-off-by: Tres Walsh <6d279684697be182a0e83229177fc126bcf5026c@mnmlstc.com>

am0d/bit