cc-wrapper: Use stdenvNoCC to build

cc-wrapper may wrap a cc-compiler, but it doesn't need one to build
itself. (c.f. expand-response-params is a separate derivation.) This
helps avoid cycles on the cross stuff, in addition to removing a
useless dependency edge.

I could have been super careful with overrides in the stdenv to avoid
the mass rebuild, but I don't think it's worth it.

pkgs/stdenv/linux/default.nix

@@ -84,7 +84,7 @@ let
           libc = prevStage.glibc;
           inherit (prevStage) binutils coreutils gnugrep;
           name = name;
-          stdenv = prevStage.ccWrapperStdenv;
+          stdenvNoCC = prevStage.ccWrapperStdenv;
         };
 
         extraAttrs = {
@@ -244,7 +244,7 @@ in
         };
         cc = prevStage.gcc-unwrapped;
         libc = self.glibc;
-        inherit (self) stdenv binutils coreutils gnugrep;
+        inherit (self) stdenvNoCC binutils coreutils gnugrep;
         name = "";
         shell = self.bash + "/bin/bash";
       };