Use jailbreak to get rid of overspecified version restrictions to fix

builds of Agda, accelerate-cuda, clientsession, filestore, ghc-events,
gitit, happstack, happstack, happstack, hledger-lib, hledger, mime-mail,
pandoc, snap, wai-app-static, yesod-static, and urlencoded.

pkgs/development/libraries/haskell/happstack/happstack-hamlet.nix

@@ -5,9 +5,7 @@ cabal.mkDerivation (self: {
   version = "7.0.1";
   sha256 = "13ayypl2x402h6a7yq7fvgd2mn21gl5gcw2hk7f5vr2bdlvwv53n";
   buildDepends = [ hamlet happstackServer text ];
-  patchPhase = ''
-    sed -i -e 's|hamlet .*,|hamlet,|' happstack-hamlet.cabal
-  '';
+  jailbreak = true;
   meta = {
     homepage = "http://www.happstack.com/";
     description = "Support for Hamlet HTML templates in Happstack";

pkgs/development/libraries/haskell/happstack/happstack-server.nix

@@ -13,9 +13,7 @@ cabal.mkDerivation (self: {
     html monadControl mtl network parsec sendfile syb systemFilepath
     text time transformers transformersBase utf8String xhtml zlib
   ];
-  patchPhase = ''
-    sed -i -e 's|base64-bytestring.*,|base64-bytestring,|' happstack-server.cabal
-  '';
+  jailbreak = true;
   meta = {
     homepage = "http://happstack.com";
     description = "Web related tools and services";

pkgs/development/libraries/haskell/happstack/happstack-util.nix

@@ -12,9 +12,7 @@ cabal.mkDerivation (self: {
     extensibleExceptions filepath hslogger mtl network parsec random
     time unixCompat
   ];
-  patchPhase = ''
-    sed -i -e 's|mtl >= 1.1 && < 2.1|mtl|' happstack-util.cabal
-  '';
+  jailbreak = true;
   meta = {
     homepage = "http://happstack.com";
     description = "Web framework";