High-level dependencies build without system's PATH

The high-level dependencies are now built without having access to the
system's PATH. To do this, all the necessary software that we aren't
building ourselves are now brought into the installed `bin/' directory
using a symbolic link to the corresponding software on the host. To do
this, it was also necessary to increase the number of basic/low-level
packages that we are building, and add several more (Diffutils and
Findutils).

With this process in place, we now have a list of the exact software
packages that we are not building our selves, enabling easy building of all
such dependencies in the future.

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