cdparanoia: Fix private keyword in header

Patch taken from SVN, cdparanoia has not had a release since September
11, 2008.  Allows including the header in C++ files.

https://trac.xiph.org/changeset/15338/

pkgs/applications/audio/cdparanoia/default.nix

@@ -17,7 +17,8 @@ stdenv.mkDerivation rec {
       url = "https://trac.macports.org/export/70964/trunk/dports/audio/cdparanoia/files/patch-paranoia_paranoia.c.10.4.diff";
       sha256 = "17l2qhn8sh4jy6ryy5si6ll6dndcm0r537rlmk4a6a8vkn852vad";
     })
-  ] ++ stdenv.lib.optional stdenv.hostPlatform.isMusl ./utils.patch;
+    ] ++ stdenv.lib.optional stdenv.hostPlatform.isMusl ./utils.patch
+    ++ [./fix_private_keyword.patch];
 
   buildInputs = stdenv.lib.optional stdenv.isAarch64 autoreconfHook;