Move preparation tasks to necessary software definitions

Basically, a trial-and-error attempt. As per my understanding, it saves at least the following software definitions from being rebuilt because of preparation dirtying the cache.

1. preparation
2. package-scripts
3. zlib
4. cacerts
5. xproto
6. util-macros
7. config_guess
8. pkg-config-lite
9. makedepend
10. openssl
11. curl
12. git
13. redis
14. jemalloc
15. ncurses
16. libedit
17. pcre
18. nginx
19. libtool
20. libffi
21. libyaml
22. libiconv
23. ruby
24. rubygems
25. mixlib-log
26. chef-zero
27. ohai
28. rb-readline
29. chef-gem
30. remote-syslog
31. popt
32. logrotate
33. runit
34. bundler