Issue description

Our CC wrapper doesn't wrap all the binaries that GCC provides -- namely prefixed with architecture x86_64-unknown-gnu-gcc and variations. Because unwrapped GCC is propagated to user environments from the wrapper it ends up in the path (for example in FHS environments). One example of problem that it causes is that OpenWrt picks it up and fails to compile.

wrapCC needs to detect and wrap those.

Steps to reproduce

1. buildEnv { paths = [ gcc ]; } (you can also add it to environment.systemPackages or buildFHSUserEnv);
2. Try to compile something with x86_64-unknown-gnu-gcc (prefix may vary).

Technical details

• Nixpkgs version: (run nix-instantiate --eval '<nixpkgs>' -A lib.nixpkgsVersion) 59dbcef