Missing deps for debian/ubuntu cargo install

[m-rutter]

The cargo install documentation is missing the following packages for debian/ubuntu systems:

• build-essential
• libxcursor-dev
• libxi-dev

I needed to install the latter two to compile the x11 dependencies in addition to the others in the docs, and I'm guessing you need the first.

[hendursaga]

As I mentioned here, I'm using Debian Stable with Wayland and didn't have to install anything extra, although it's probable I already had whatever dependencies were needed. Not sure what dependencies you'd need for either X11 or Wayland support nowadays, but perhaps the dependency listing could have options for either?