binaryen: simplify build

pkgs/development/compilers/binaryen/default.nix

@@ -1,39 +1,16 @@
-{ stdenv, cmake, python3, fetchFromGitHub, emscriptenRev ? null, substituteAll }:
-
-let
-  defaultVersion = "95";
-
-  # Map from git revs to SHA256 hashes
-  sha256s = {
-    version_95 = "1w4js9bm5qv5aws8bzz4f0n3ni2l7h4fidkq9v5bldf0zxncy8m3";
-    "1.39.1" = "0ygm9m5322h4vfpf3j63q32qxk2l26yk62hh7dkb49j51zwl1y3y";
-  };
-in
+{ stdenv, cmake, python3, fetchFromGitHub }:
 
 stdenv.mkDerivation rec {
-  version = if emscriptenRev == null
-            then defaultVersion
-            else "emscripten-${emscriptenRev}";
-  rev = if emscriptenRev == null
-        then "version_${version}"
-        else emscriptenRev;
   pname = "binaryen";
+  version = "95";
 
   src = fetchFromGitHub {
     owner = "WebAssembly";
     repo = "binaryen";
-    sha256 =
-      if builtins.hasAttr rev sha256s
-      then builtins.getAttr rev sha256s
-      else null;
-    inherit rev;
+    rev = "version_${version}";
+    sha256 = "1w4js9bm5qv5aws8bzz4f0n3ni2l7h4fidkq9v5bldf0zxncy8m3";
   };
 
-  patches = stdenv.lib.optional (emscriptenRev != null) (substituteAll {
-    src = ./0001-Get-rid-of-git-dependency.patch;
-    emscriptenv = "1.39.1";
-  });
-
   nativeBuildInputs = [ cmake python3 ];
 
   meta = with stdenv.lib; {