meson plugin uses internet access during build, instead of pull

[Dimitri John Ledkov]

meson plugin uses internet access during build, instead of pull

It generates build command:
/usr/bin/python3 -m pip install -U {meson_package}

Ideally that should be pulled-in during pull stage

I think I will have to unroll meson plugin, and do what it does by hand, such that I can shuffle `pip install` during override-pull, instead of during build.

As I am running out of network access time during riscv builds with meson.