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/5.7.nix

@@ -8,6 +8,8 @@ stdenv.mkDerivation rec {
     substituteInPlace configure.ac --replace stdc++ c++
   '';
 
+  patches = [ ./5.7-new-libffi-FFI_SYSV.patch ];
+
   buildInputs = [ libffi gmp ];
 
   nativeBuildInputs = stdenv.lib.optional stdenv.isDarwin autoreconfHook;