ibtool: add to toolchain

- init package
- add into xcbuild/toolchain.nix

pkgs/development/tools/xcbuild/toolchain.nix

@@ -1,6 +1,7 @@
 {stdenv, writeText, toolchainName, xcbuild, fetchurl
 , llvm, cctools, gcc, bootstrap_cmds, binutils
-, yacc, flex, m4, unifdef, gperf, indent, ctags, makeWrapper}:
+, yacc, flex, m4, unifdef, gperf, indent, ctags, makeWrapper
+, ibtool}:
 
 let
 
@@ -89,6 +90,8 @@ stdenv.mkDerivation {
     ln -s ${cctools}/bin/pagestuff
     ln -s ${cctools}/bin/ranlib
     ln -s ${cctools}/bin/redo_prebinding
+
+    ln -s ${ibtool}/bin/ibtool
   '' +
     # No point including the entire gcc closure if we don't already have it
     (if stdenv.cc.isClang then ''