clisp: Add patch to remove reference to cfree

Fixes the build failure after the upgrade to glibc 2.26 in
9bb67d5c1e.

From the cfree(3) manpage:

This function should never be used. Use free(3) instead. Starting with
version 2.26, it has been removed from glibc.

From the glibc 2.26 release notes[1]:

* The obsolete function cfree has been removed.  Applications should use
  free instead.

[1]: https://sourceware.org/ml/libc-alpha/2017-08/msg00010.html

Signed-off-by: aszlig <aszlig@nix.build>
Cc: @7c6f434c, @tohl

pkgs/development/interpreters/clisp/default.nix

@@ -48,7 +48,11 @@ stdenv.mkDerivation rec {
     libX11 libXau libXt libXpm xproto libXext xextproto
   ];
 
-  patches = [ ./bits_ipctypes_to_sys_ipc.patch ]; # from Gentoo
+  patches = [
+    ./bits_ipctypes_to_sys_ipc.patch # from Gentoo
+    # The cfree alias no longer exists since glibc 2.26
+    ./remove-cfree-binding.patch
+  ];
 
   # First, replace port 9090 (rather low, can be used)
   # with 64237 (much higher, IANA private area, not