haskell-cgi: mark version 3001.2.0.0 broken

It needs mtl >=2.2.1 && <2.3, and we cannot easily satisfy this requirement.

It's interesting to observe how "cgi" remains broken in current versions of GHC
for months, despite the fact that it's a Haskell Platform package. Makes one
wonder about the purpose of the Haskell Platform, no? In the end, if there is
no maintainer for a package, then it stays unmaintained, HP member or not.

pkgs/development/libraries/haskell/cgi/3001.2.0.0.nix

···
     description = "A library for writing CGI programs";
     license = self.stdenv.lib.licenses.bsd3;
     platforms = self.ghc.meta.platforms;
+    hydraPlatforms = self.stdenv.lib.platforms.none;
+    broken = true;
   };
 })