SDL: include cf-private on darwin

It's not included implicitly by the frameworks anymore.

    Undefined symbols for architecture x86_64:
      "_NSDefaultRunLoopMode", referenced from:
          _QZ_PumpEvents in SDL_QuartzEvents.o
      "_OBJC_CLASS_$_NSArray", referenced from:
          objc-class-ref in SDL_QuartzEvents.o
      "_OBJC_CLASS_$_NSDate", referenced from:
          objc-class-ref in SDL_QuartzEvents.o
    ld: symbol(s) not found for architecture x86_64

pkgs/development/libraries/SDL/default.nix

@@ -4,6 +4,7 @@
 , x11Support ? stdenv.hostPlatform == stdenv.buildPlatform, libXext, libICE, libXrandr
 , pulseaudioSupport ? true, libpulseaudio
 , OpenGL, CoreAudio, CoreServices, AudioUnit, Kernel, Cocoa
+, cf-private
 }:
 
 # NOTE: When editing this expression see if the same change applies to
@@ -41,7 +42,11 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ ]
     ++ optional (!stdenv.hostPlatform.isMinGW) audiofile
-    ++ optionals stdenv.isDarwin [ AudioUnit CoreAudio CoreServices Kernel OpenGL ];
+    ++ optionals stdenv.isDarwin [
+      AudioUnit CoreAudio CoreServices Kernel OpenGL
+      # Needed for NSDefaultRunLoopMode symbols.
+      cf-private
+    ];
 
   configureFlags = [
     "--disable-oss"

pkgs/top-level/all-packages.nix

@@ -12126,6 +12126,7 @@ with pkgs;
     alsaSupport = stdenv.isLinux;
     x11Support = !stdenv.isCygwin;
     pulseaudioSupport = config.pulseaudio or stdenv.isLinux;
+    inherit (darwin) cf-private;
     inherit (darwin.apple_sdk.frameworks) OpenGL CoreAudio CoreServices AudioUnit Kernel Cocoa;
   };