texlive: build bibtex-x and xetex on darwin

We also no longer need to specify that harfbuzz and icu not be used, and
DYLD_LIBRARY_PATH is properly configured to find graphite2.

pkgs/tools/typesetting/tex/texlive/default.nix

@@ -119,18 +119,11 @@ rec {
     "--with-system-libgs" "--with-system-t1lib" "--with-system-freetype2" 
     "--with-system-freetype=no" "--disable-ttf2pk" "--enable-ttf2pk2" ]
     ++ stdenv.lib.optionals stdenv.isDarwin [
-      # Complains about a missing ICU directory
-      "--disable-bibtex-x"
-
       # TODO: We should be able to fix these tests
       "--disable-devnag"
       "--disable-dvisvgm"
       "--disable-xdv2pdf"
       "--disable-xdvipdfmx"
-      "--disable-xetex"
-
-      "--with-system-harfbuzz=no"
-      "--with-system-icu=no"
     ];
 
   phaseNames = [ "addInputs" "doMainBuild" "doMakeInstall" "doPostInstall" ];