Create additional SMF manifest file for new pkgsrc

SmartOS 1.6 used pkgsrc from 2011Q4, while newer
SmartOS versions use 2012Q2.  Amongst the changes
in pkgsrc are changes to libary paths and GNU tool
paths that we depend on.  This change allows us to
build packages for both 1.6 and 1.8 versions of SmartOS.