haskell-gi: remember the URL to the PR that explains why the override is necessary

Changed files
+1 -2
pkgs
development
haskell-modules
+1 -2
pkgs/development/haskell-modules/configuration-common.nix
···
# https://github.com/evanrinehart/mikmod/issues/1
mikmod = addExtraLibrary super.mikmod pkgs.libmikmod;
-
# The doctest phase fails because it does not have a proper environment in
-
# which to run the commands it's ought to test.
+
# https://github.com/haskell-gi/haskell-gi/pull/163
haskell-gi = dontCheck super.haskell-gi;
# https://github.com/basvandijk/threads/issues/10