CMake gets rebuilt for cross because of run-time dependency on pkg-config

[Ericson2314]

I try to do some weird cross and notice that cmake is being rebuilt. That's odd.

Here's why:

1. pkg-config now has a target-specific wrapper.
2. CMake has long had a run-time dep on package config

So either we give CMake a wrapper too (ugh...) or we just remove pkg-config from buildDepends of CMake. I learn towards the latter.

CC @matthewbauer and @LnL7, who I think added the dep?

[LnL7]

I only made some dependencies optional at some point to reduce the number of things needed to bootstrap. What's the issue exactly? If you mean moving pkgconfig to nativeBuildInputs then that sounds fine to me.

[Ericson2314]

What's the issue exactly?

CMake is rebuilt when it's target platform changes..

If you mean moving pkgconfig to nativeBuildInputs then that sounds fine to me.

Oh, I assume it had some nativeBuildInputs and so it was in buildInputs in purpose, but maybe it wasn't!

Also, do we know what the setup hook is a buildInput?

Oh yeah, because CMake kinda bootstraps itself.