Revert "lib: Clean up how linux and gcc config is specified"

This is a stdenv-rebuild, and should not be merged
into master

This reverts commit 8929989614.

lib/systems/default.nix

@@ -24,6 +24,8 @@ rec {
       # Either of these can be losslessly-extracted from `parsed` iff parsing succeeds.
       system = parse.doubleFromSystem final.parsed;
       config = parse.tripleFromSystem final.parsed;
+      # Just a guess, based on `system`
+      platform = platforms.select final;
       # Determine whether we are compatible with the provided CPU
       isCompatible = platform: parse.isCompatible final.parsed.cpu platform.parsed.cpu;
       # Derived meta-data
@@ -77,16 +79,7 @@ rec {
       };
       isStatic = final.isWasm || final.isRedox;
 
-      # Just a guess, based on `system`
-      inherit
-        ({
-          linux-kernel = args.linux-kernel or {};
-          gcc = args.gcc or {};
-          rustc = args.rust or {};
-        } // platforms.select final)
-        linux-kernel gcc rustc;
-
-      linuxArch =
+      kernelArch =
         if final.isAarch32 then "arm"
         else if final.isAarch64 then "arm64"
         else if final.isx86_32 then "x86"