Drop obsolete Haskell packages WebBits, WebBitsHtml, JsContracts, and flapjax.

None of our compilers can build these packages. I suppose that stuff has
been replaced by language-ecmascript.

pkgs/development/compilers/flapjax/default.nix

@@ -1,30 +0,0 @@
-{cabal, fetchurl, unzip, xhtml, WebBits, WebBitsHtml, JsContracts}:
-
-cabal.mkDerivation ( self: {
-  pname = "flapjax";
-  version = "2.1";
-
-  src = fetchurl {
-    url = https://github.com/brownplt/flapjax/zipball/Flapjax-2.1;
-    name = "flapjax-2.1.zip";
-    sha256 = "1cp9g570528a813ljnvd1lb389iz0i6511xynf6kzryv8ckc1n7v";
-  };
-
-  # The Makefile copies some files to update the flapjax website into
-  # missing directories; the -p is to avoid these errors.
-  preConfigure = ''
-    cd fx
-    sed -i 's/mkdir/mkdir -p/' Makefile
-    make
-    cd ../compiler
-  '';
-
-  extraBuildInputs = [ unzip JsContracts ];
-  propagatedBuildInputs = [ xhtml WebBits WebBitsHtml ];
-
-  meta = { 
-      description = "programming language designed around the demands of modern, client-based Web applications";
-      homepage = http://www.flapjax-lang.org/;
-      license = "BSD";
-  };
-})

pkgs/development/libraries/haskell/JsContracts/default.nix

@@ -1,17 +0,0 @@
-{ cabal, filepath, mtl, parsec, syb, WebBits, WebBitsHtml }:
-
-cabal.mkDerivation (self: {
-  pname = "JsContracts";
-  version = "0.5.3";
-  sha256 = "17l6kdpdc7lrpd9j4d2b6vklkpclshcjy6hzpi442b7pj96sn589";
-  isLibrary = true;
-  isExecutable = true;
-  buildDepends = [ filepath mtl parsec syb WebBits WebBitsHtml ];
-  meta = {
-    homepage = "http://www.cs.brown.edu/research/plt/";
-    description = "Design-by-contract for JavaScript";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})

pkgs/development/libraries/haskell/WebBits-Html/1.0.1.nix

@@ -1,15 +0,0 @@
-{ cabal, mtl, parsec, syb, WebBits }:
-
-cabal.mkDerivation (self: {
-  pname = "WebBits-Html";
-  version = "1.0.1";
-  sha256 = "134rmm5ccfsjdr0pdwn2mf81l81rgxapa3wjjfjkxrkxq6hav35n";
-  buildDepends = [ mtl parsec syb WebBits ];
-  meta = {
-    homepage = "http://www.cs.brown.edu/research/plt/";
-    description = "JavaScript analysis tools";
-    license = "LGPL";
-    platforms = self.ghc.meta.platforms;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})

pkgs/development/libraries/haskell/WebBits-Html/1.0.2.nix

@@ -1,15 +0,0 @@
-{ cabal, mtl, parsec, syb, WebBits }:
-
-cabal.mkDerivation (self: {
-  pname = "WebBits-Html";
-  version = "1.0.2";
-  sha256 = "18dd52970cd27kra4l89vvrx2mrdbqd4w4f76xrq3142daxsagal";
-  buildDepends = [ mtl parsec syb WebBits ];
-  meta = {
-    homepage = "http://www.cs.brown.edu/research/plt/";
-    description = "JavaScript analysis tools";
-    license = "LGPL";
-    platforms = self.ghc.meta.platforms;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})

pkgs/development/libraries/haskell/WebBits/1.0.nix

@@ -1,15 +0,0 @@
-{ cabal, mtl, parsec, syb }:
-
-cabal.mkDerivation (self: {
-  pname = "WebBits";
-  version = "1.0";
-  sha256 = "1xqk4ajywlaq9nb9a02i7c25na5p2qbpc2k9zw93gbapppjiapsc";
-  buildDepends = [ mtl parsec syb ];
-  meta = {
-    homepage = "http://www.cs.brown.edu/research/plt/";
-    description = "JavaScript analysis tools";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})

pkgs/development/libraries/haskell/WebBits/2.0.nix

@@ -1,15 +0,0 @@
-{ cabal, mtl, parsec, syb }:
-
-cabal.mkDerivation (self: {
-  pname = "WebBits";
-  version = "2.0";
-  sha256 = "14a1rqlq925f6rdbi8yx44xszj5pvskcmw1gi1bj8hbilgmlwi7f";
-  buildDepends = [ mtl parsec syb ];
-  meta = {
-    homepage = "http://www.cs.brown.edu/research/plt/";
-    description = "JavaScript analysis tools";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})

pkgs/development/libraries/haskell/WebBits/2.2.nix

@@ -1,15 +0,0 @@
-{ cabal, mtl, parsec, syb }:
-
-cabal.mkDerivation (self: {
-  pname = "WebBits";
-  version = "2.2";
-  sha256 = "1frmnjbpgm76dzs1p4766fb6isqc3pxv4dnj8sdhnfliv5j0xv2z";
-  buildDepends = [ mtl parsec syb ];
-  meta = {
-    homepage = "http://github.com/brownplt/webbits";
-    description = "JavaScript analysis tools";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})