gcc, glibc: merge changes from original multiple-output

Can't be done automatically because of file copies/moves.

pkgs/development/compilers/gcc/4.8/default.nix

@@ -195,7 +195,7 @@ let version = "4.8.3";
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if cross != null then "-${cross.config}" + stageNameAddon else "";
 
-  bootstrap = cross == null && !stdenv.isArm && !stdenv.isMips;
+    bootstrap = cross == null && !stdenv.isArm && !stdenv.isMips;
 
 in
 
@@ -214,6 +214,13 @@ stdenv.mkDerivation ({
 
   inherit patches;
 
+  outputs = [ "out" "lib" ];
+
+  setOutputConfigureFlags = false;
+
+
+  libc_dev = stdenv.gcc.libc_dev;
+
   postPatch =
     if (stdenv.isGNU
         || (libcCross != null                  # e.g., building `gcc.crossDrv'