[arch-general] split packages documentation

[Ali H. Caliskan]

Perhaps I should start posting topless then :) Well Allan, if you can't see
the benefits of this, then I shouldn't bother mentioning the KISS
philosophy. Also, for instance, compiling gcc and gcc-libs would reduce time
and costs for the developers.

and what that is supposed to achieve?
> also explain the separation of the build function into separate functions
> The depends array that you demonstrate does not work in bash. Can you
>
> This message also demonstrates why top posting is annoying...
>