aterm-2.8: add comment about build failures with gcc 4.8.x

pkgs/development/libraries/aterm/2.8.nix

@@ -16,6 +16,11 @@ stdenv.mkDerivation ( {
     ./max-long.patch
   ] ++ ( if isMingw then [./aterm-mingw-asm.patch] else [] );
 
+  # The test programs stress, randgen, fib, and testsafio all fail with
+  # segmentation faults when compiled with GCC 4.8.x, and the code itself many
+  # warnings, complaining "cast from pointer to integer of different size".
+  # This looks really bad. I leave the test suite enabled, because those issue
+  # feel too serious to just ignore.
   doCheck = true;
 
   meta = {