Revert "pkgs/top-level/stage.nix: add pkgsLLVMLibc"

This reverts commit 41b14024d2.

lib/systems/default.nix

@@ -121,8 +121,6 @@ let
               "uclibc"
             else if final.isAndroid then
               "bionic"
-            else if final.isLLVMLibc then
-              "llvm"
             else if
               final.isLinux # default
             then
@@ -248,7 +246,7 @@ let
           # don't support dynamic linking, but don't get the `staticMarker`.
           # `pkgsStatic` sets `isStatic=true`, so `pkgsStatic.hostPlatform` always
           # has the `staticMarker`.
-          isStatic = final.isWasi || final.isRedox || final.isLLVMLibc;
+          isStatic = final.isWasi || final.isRedox;
 
           # Just a guess, based on `system`
           inherit

lib/systems/inspect.nix

@@ -386,7 +386,6 @@ rec {
         uclibceabi
         uclibceabihf
       ];
-    isLLVMLibc = [ { abi = abis.llvm; } ];
 
     isEfi = [
       {

lib/systems/parse.nix

@@ -740,9 +740,6 @@ rec {
     };
     uclibc = { };
 
-    # LLVM libc
-    llvm = { };
-
     unknown = { };
   };