polyml: fix with new libffi

New libffi doesn't have FFI_SYSV for x86/64 unix, this pulls in the
commit for the upstream version which fixes it, and ports that patch to
the 5.7 version. The 5.6 version is unchanged.

For ZHF: #80379

pkgs/development/compilers/polyml/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, autoreconfHook, gmp, libffi }:
+{ stdenv, fetchFromGitHub, fetchpatch, autoreconfHook, gmp, libffi }:
 
 stdenv.mkDerivation rec {
   pname = "polyml";
@@ -8,6 +8,14 @@ stdenv.mkDerivation rec {
     substituteInPlace configure.ac --replace stdc++ c++
   '';
 
+  patches = [
+    (fetchpatch {
+      name = "new-libffi-FFI_SYSV.patch";
+      url = "https://github.com/polyml/polyml/commit/ad32de7f181acaffaba78d5c3d9e5aa6b84a741c.patch";
+      sha256 = "007q3r2h9kfh3c1nv0dyhipmak44q468ab9bwnz4kk4a2dq76n8v";
+    })
+  ];
+
   buildInputs = [ libffi gmp ];
 
   nativeBuildInputs = stdenv.lib.optional stdenv.isDarwin autoreconfHook;