bootstrap env: disable stackprotector hardening until gcc >=4.9

pkgs/development/libraries/zlib/default.nix

@@ -29,6 +29,9 @@ stdenv.mkDerivation (rec {
     fi
   '';
 
+  # FIXME needs gcc 4.9 in bootstrap tools
+    hardening_stackprotector = false;
+
   # As zlib takes part in the stdenv building, we don't want references
   # to the bootstrap-tools libgcc (as uses to happen on arm/mips)
   NIX_CFLAGS_COMPILE = stdenv.lib.optionalString (!stdenv.isDarwin) "-static-libgcc";