haskellPackages.mkDerivation: jailbreak any/all cabal files

Since Cabal only allows a single cabal file per directory, we can just
jailbreak *.cabal which works even if the user doesn't have set pname to
match the cabal file name (which they SHOULD do, though).

The only remaining reference to ${pname}.cabal in the revision handling
code is fine since we know the proper name of the cabal file from
Hackage in that case.

pkgs/development/haskell-modules/generic-builder.nix

@@ -614,7 +614,7 @@ lib.fix (
       postPatch =
         optionalString jailbreak ''
           echo "Run jailbreak-cabal to lift version restrictions on build inputs."
-          ${jailbreak-cabal}/bin/jailbreak-cabal ${pname}.cabal
+          ${jailbreak-cabal}/bin/jailbreak-cabal *.cabal
         ''
         + postPatch;