ntl: 9.11.0 -> 11.2.1

ntl hasn't been updated in a while. So I'm doing that and adding myself
as the maintainer. I'm also adding some options and pinning the sage
dependency, since it is unfortunately not compatible with the latest ntl
yet.

I've also enabled the tests, since they don't take terribly long and are
worth the time in my opinion.

pkgs/development/libraries/flint/default.nix

@@ -37,6 +37,10 @@ stdenv.mkDerivation rec {
   ] ++ stdenv.lib.optionals withBlas [
     "--with-blas=${openblas}"
   ];
+
+  # issues with ntl -- https://github.com/wbhart/flint2/issues/487
+  NIX_CFLAGS_COMPILE = [ "-std=c++11" ];
+
   patches = [
     (fetchpatch {
       # Always produce libflint.so.MAJOR; will be included in the next flint version