Update omnibus-ruby and omnibus-software
Remove software defs that were updated upstream
Update the Makefile for omnibus-ruby 3.2.1
Use Config.project_root

The Omnibus.project_root method has been deprecated.
Use install_dir instead of install_path
Update dependency and Ohai syntax
Vendor libffi.rb from omnibus-software

Source:
https://github.com/opscode/omnibus-software/blob/7ac92daa6892e0898eb868679e578df530e38ee8/config/software/libffi.rb
Use 'copy' instead of 'move'

See:
https://github.com/opscode/omnibus-software/pull/277
Remove LD_LIBRARY_PATH variable that nobody needs
Merge branch 'update/omnibus' into 'master'

Update omnibus-ruby to 3.2.1

See merge request !177