Use Zig cc to cross‐compile a CMake project

[jcbhmr]

https://github.com/ziglang/zig/wiki/Use-zig-cc-to-cross%E2%80%90compile-a-CMake-project

[AndyKelley]

This is a nice blog post. Whoever wrote it should move it to their personal blog because it does not belong on the ziglang GitHub wiki and so I'm going to remove it imminently.

[cpswan → AndyKelley]

For anybody who doesn't want to go scratching around in the wiki git history, I dropped the markdown into a gist - https://gist.github.com/cpswan/2b65fa11c83c8d16dc464bb0f9a91...