Disable use of graphite2 on darwin until #2800 is fixed

This applies to harfbuzz, pango and texlive.

pkgs/development/libraries/harfbuzz/default.nix

@@ -1,7 +1,7 @@
 { stdenv, fetchurl, pkgconfig, glib, freetype, cairo, libintlOrEmpty
 , icu, graphite2
 , withIcu ? false # recommended by upstream as default, but most don't needed and it's big
-, withGraphite2 ? true # it is small and major distros do include it
+, withGraphite2 ? !stdenv.isDarwin # it is small and major distros do include it
 }:
 
 # TODO: split non-icu and icu lib into different outputs?

pkgs/top-level/all-packages.nix

@@ -10956,7 +10956,7 @@ let
       libXmu libXext xextproto libSM libICE;
     ghostscript = ghostscriptX;
     harfbuzz = harfbuzz.override {
-      withIcu = true; withGraphite2 = true;
+      withIcu = true; withGraphite2 = !stdenv.isDarwin;
     };
   };