Dependencies clarifications

[JasonGantner]

It seems libglew is listed as a dependency but is not used anywhere in the code.

Also libwegl is listed but is actually libwayland-egl and should be part of any wayland deployment. I don't see the reason for listing it in addition to wayland. This is reflected by its absence in the list of packages to be installed on either Debian or Arch.

Did I miss something somewhere or does the readme need an update?