virtualbox: Drop dontPatchELF hack

However, this also requires ad8f31df7f
to get rid of gcc_multi.out in the closure.

pkgs/development/tools/misc/patchelf/unstable.nix

@@ -0,0 +1,26 @@
+{ stdenv, fetchFromGitHub, autoreconfHook }:
+
+stdenv.mkDerivation rec {
+  name = "patchelf-0.10-pre-20160920";
+
+  src = fetchFromGitHub {
+    owner = "NixOS";
+    repo = "patchelf";
+    rev = "327d80443672c397970738f9e216a7e86cbf3ad7";
+    sha256 = "0nghzywda4jrj70gvn4dnrzasafgdp0basj04wfir1smvsi047zr";
+  };
+
+  setupHook = [ ./setup-hook.sh ];
+
+  buildInputs = [ autoreconfHook ];
+
+  doCheck = true;
+
+  meta = {
+    homepage = http://nixos.org/patchelf.html;
+    license = "GPL";
+    description = "A small utility to modify the dynamic linker and RPATH of ELF executables";
+    maintainers = [ stdenv.lib.maintainers.eelco ];
+    platforms = stdenv.lib.platforms.all;
+  };
+}