Motivation for this change

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

Notify maintainers

cc @globin Contribution from Nixcon Hackathon.

This commit wasn't even compiled, so will likely have syntax errors. It was made by running a crude sequence of sed steps, after discussing with @globin at Nixcon. These were the sed steps for example for one set of flags:

rg -l 'configureFlags = "' | xargs -n 1 sed -i 's/Flags = "\([^ ]*\) \(.*\)"/Flags = "\1" "\2"/'
rg -l 'configureFlags = "' | xargs -n 1 sed -i 's/Flags = "\([^ ]*\)" "\([^ ]*\) \(.*\)"/Flags = "\1" "\2" "\3"/' 
rg -l 'configureFlags = "' | xargs -n 1 sed -i 's/Flags = "\([^ ]*\)" "\([^ ]*\)" "\([^ ]*\) \(.*\)"/Flags = "\1" "\2" "\3" "\4"/' 
rg -l 'configureFlags = "[^ ]*"' | xargs -n 1 sed -i 's/Flags = "\(.*\)"/Flags = \[ "\1" \]/'

This gets quite a few constructs wrong, I've fixed the ones I've noticed wrong. It will get legitimate spaces inside the strings wrong, or if there is an if else on the same line.

I'll make a small python program that will work better, so other flags can be changed by @globin when he comes across more.