libcanberra/libcanberra-gtk2: fix build on darwin

All libcanberra/libcanberra-gtk2/libcanberra-gtk3 packages were marked
as broken on commit 806d814516 (libcanberra: mark broken on darwin,
2021-02-11), but only libcanberra-gtk3 is broken due to the missing
header.

This commit refactors how to enable GTK support, to mark just
libcanberra-gtk3 as broken and allow building libcanberra and
libcanberra-gtk2.

libcanberra builds but the linker fails with:

    ld: file not found: /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon for architecture x86_64
    clang-7: error: linker command failed with exit code 1 (use -v to see invocation)

Adding Carbon to the inputs solves the problem.

libcanberra-gtk2 builds and the linker finishes without the above error,
most likely because it depends on gtk2 and gtk2 depends on Cocoa.

Also fix some issues with the derivation:

- Use pname/version instead of name.
- Use lib.optionalString to set postPatch.
- Only set passthru if building with GTK support, and ensure that the
  proper directory is passed for each GTK version.

pkgs/development/libraries/libcanberra/default.nix

@@ -1,22 +1,25 @@
 { stdenv, lib, fetchurl, fetchpatch, pkg-config, libtool
-, gtk ? null
+, gtk2-x11, gtk3-x11 , gtkSupport ? null
 , libpulseaudio, gst_all_1, libvorbis, libcap
-, CoreServices
+, Carbon, CoreServices
 , withAlsa ? stdenv.isLinux, alsa-lib }:
 
 stdenv.mkDerivation rec {
-  name = "libcanberra-0.30";
+  pname = "libcanberra";
+  version = "0.30";
 
   src = fetchurl {
-    url = "http://0pointer.de/lennart/projects/libcanberra/${name}.tar.xz";
+    url = "http://0pointer.de/lennart/projects/libcanberra/${pname}-${version}.tar.xz";
     sha256 = "0wps39h8rx2b00vyvkia5j40fkak3dpipp1kzilqla0cgvk73dn2";
   };
 
   nativeBuildInputs = [ pkg-config libtool ];
   buildInputs = [
-    libpulseaudio libvorbis gtk
+    libpulseaudio libvorbis
   ] ++ (with gst_all_1; [ gstreamer gst-plugins-base ])
-    ++ lib.optional stdenv.isDarwin CoreServices
+    ++ lib.optional (gtkSupport == "gtk2") gtk2-x11
+    ++ lib.optional (gtkSupport == "gtk3") gtk3-x11
+    ++ lib.optionals stdenv.isDarwin [Carbon CoreServices]
     ++ lib.optional stdenv.isLinux libcap
     ++ lib.optional withAlsa alsa-lib;
 
@@ -30,7 +33,7 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  postPatch = (lib.optional stdenv.isDarwin) ''
+  postPatch = lib.optionalString stdenv.isDarwin ''
     patch -p0 < ${fetchpatch {
       url = "https://raw.githubusercontent.com/macports/macports-ports/master/audio/libcanberra/files/patch-configure.diff";
       sha256 = "1f7h7ifpqvbfhqygn1b7klvwi80zmpv3538vbmq7ql7bkf1q8h31";
@@ -43,8 +46,8 @@ stdenv.mkDerivation rec {
     done
   '';
 
-  passthru = {
-    gtkModule = "/lib/gtk-2.0/";
+  passthru = lib.optionalAttrs (gtkSupport != null) {
+    gtkModule = if gtkSupport == "gtk2" then "/lib/gtk-2.0" else "/lib/gtk-3.0/";
   };
 
   meta = with lib; {
@@ -62,6 +65,6 @@ stdenv.mkDerivation rec {
     platforms = platforms.unix;
     # canberra-gtk-module.c:28:10: fatal error: 'gdk/gdkx.h' file not found
     # #include <gdk/gdkx.h>
-    broken = stdenv.isDarwin;
+    broken = stdenv.isDarwin && (gtkSupport == "gtk3");
   };
 }

pkgs/top-level/all-packages.nix

@@ -16295,13 +16295,13 @@ in
   libcacard = callPackage ../development/libraries/libcacard { };
 
   libcanberra = callPackage ../development/libraries/libcanberra {
-    inherit (darwin.apple_sdk.frameworks) CoreServices;
+    inherit (darwin.apple_sdk.frameworks) Carbon CoreServices;
   };
   libcanberra-gtk2 = pkgs.libcanberra.override {
-    gtk = gtk2-x11;
+    gtkSupport = "gtk2";
   };
   libcanberra-gtk3 = pkgs.libcanberra.override {
-    gtk = gtk3-x11;
+    gtkSupport = "gtk3";
   };
 
   libcanberra_kde = if (config.kde_runtime.libcanberraWithoutGTK or true)